Sylvester II or Silvester II: A Pope, Who was Educated in Muslim Spain

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Sylvester II
Silvester II.JPG
Papacy began 2 April 999
Papacy ended 12 May 1003
Predecessor Gregory V
Successor John XVII
Personal details
Birth name Gerbert d’Aurillac
Born ca. 946
BelliacAuvergneKingdom of France
Died 12 May 1003
RomePapal StatesHoly Roman Empire
Other popes named Sylvester

Pope Sylvester II or Silvester II (c. 946 – 12 May 1003) was Pope from 2 April 999 to his death in 1003. Born Gerbert d’Aurillac (Gerbert of Aurillac), he was a prolific scholar and teacher. He endorsed and promoted study of Arab/Greco-Roman arithmeticmathematics, and astronomy, reintroducing to Europe the abacus and armillary sphere, which had been lost to Europe since the end of the Greco-Roman era.[1][2][3][4] He is said to be the first to introduce in Europe the decimal numeral system using the Arabic numerals after his studies at the University of al-Karaouine in Morocco. He was the first French Pope.



Gerbert was born about 946 in the town of Belliac, near the present-day commune of Saint-Simon, CantalFrance.[5] Around 963, he entered the monastery of St. Gerald of Aurillac. In 967, Borrell II of Barcelona (947–992) visited the monastery, and the abbot asked the Count to take Gerbert with him so that the lad could study mathematics in Spainand acquire there some knowledge of Arabic learning. In the following years, Gerbert studied under the direction of Atto, Bishop of Vic, some 60 km north of Barcelona, and probably also at the nearby Monastery of Santa Maria de Ripoll.[6]

Borrell II of Barcelona was facing major defeat from the Andalusian powers so he sent a delegation to Córdoba to request a truce. Bishop Atto was part of the delegation that met with Al-Hakam II of Cordoba, who received him with honor. Atto was mesmerized by the Arabic palaces in Cordoba and returned with great respect for the Arabs. Gerbert insisted that Atto teach him more about these Arabic princes who seemed to him more interested in the sciences and literature than warfare. Gerbert was fascinated by the stories of the Christian Bishops and judges who dressed and talked like the Arabs, well-versed in mathematics and natural sciences like the great teachers of the Islamic madrasahs. This sparked Gerbert’s veneration for the Arabs and his passion for mathematics and astronomy.

In 969, Count Borrell II made a pilgrimage to Rome, taking Gerbert with him. There Gerbert met Pope John XIII (965–972) and the Emperor Otto I, surnamed the Great (936–973). The Pope persuaded Otto I to employ Gerbert as a tutor for his young son, the future Emperor Otto II (973–983). Some years later, Otto I gave Gerbert leave to study at the cathedral school of Rheims where he was soon appointed a teacher by Archbishop Adalberon.

When Otto II became Holy Roman Emperor in 973 (he was co-emperor with Otto I from 967), he appointed Gerbert the abbot of the monastery of Bobbio and also appointed him as count of the district, but the abbey had been ruined by previous abbots, and Gerbert soon returned to Rheims.

After the death of Otto II in 983, Gerbert became involved in the politics of his time. In 985, with the support of his archbishop, he opposed Lothair of France‘s (954–986) attempt to take the Lorraine from Emperor Otto III (983–1002) by supporting Hugh Capet (987–996). Capet became King of France, ending the Carolingian line of Kings in 987.

Statue of Pope Sylvester II in Aurillac, Auvergne, France.

Adalberon died on 23 January 989.[7] Gerbert was a natural candidate for his succession,[8] but Hugh Capet appointed Arnulf, an illegitimate son of Lothair instead. Arnulf was deposed in 991 for alleged treason against the King, and Gerbert was elected his successor. There was so much opposition to Gerbert’s elevation to the See of Rheims, however, that Pope John XV (985–996) sent a legate to France who temporarily suspended Gerbert from his episcopal office. Gerbert sought to show that this decree was unlawful, but a further synod in 995 declared Arnulf’s deposition invalid.

Gerbert now became the teacher of Otto III, and Pope Gregory V (996–999), Otto III’s cousin, appointed him Archbishop of Ravenna in 998. With the Emperor’s support, he was elected to succeed Gregory V as Pope in 999. Gerbert took the name of Sylvester II, alluding to Pope Sylvester I (314–335), the advisor to Emperor Constantine I (324–337). Soon after he was elected Pope, Sylvester II confirmed the position of his former rival Arnulf as archbishop of Rheims. As Pope, he took energetic measures against the widespread practices of simony and concubinageamong the clergy, maintaining that only capable men of spotless lives should be allowed to become bishops.

In 1001, the Roman populace revolted against the Emperor, forcing Otto III and Sylvester II to flee to Ravenna. Otto III led two unsuccessful expeditions to regain control of the city, and died on a third expedition in 1002. Sylvester II returned to Rome soon after the Emperor’s death, although the rebellious nobility remained in power, and died a little later. Sylvester is buried in St. John Lateran.

Works and teaching[edit]

Gerbert was said to be one of the most noted scientists of his time. Gerbert wrote a series of works dealing with matters of thequadrivium (arithmeticgeometryastronomymusic), which he taught using the basis of the trivium (grammarlogic, and rhetoric). Walid Amine Salhab asserts that Gerbert’s reintroduction of the emphasis on these liberal arts in Europe was inspired by the educational institution of Cordoba in Islamic Spain.[9] In Rheims, he constructed a hydraulic-powered organ with brass pipes that excelled all previously known instruments,[10] where the air had to be pumped manually. In a letter of 984, Gerbert asks Lupitus of Barcelona for a book on astrology and astronomy, two terms historian S. Jim Tester says Gerbert used synonymously.[11] Gerbert may have been the author of a description of the astrolabe that was edited by Hermannus Contractus some 50 years later. Besides these, as Sylvester II he wrote a dogmatic treatise, De corpore et sanguine Domini—On the Body and Blood of the Lord.

Abacus and Hindu–Arabic numerals[edit]

Reconstructed Ancient RomanAbacus.

Gerbert learned of Hindu–Arabic digits and applied this knowledge to the abacus, but according toCharles Seife without the numeral of zero.[12] According to William of Malmesbury (c. 1080–c. 1143), Gerbert got the idea of the computing device of the abacus from a Spanish Arab. The abacus that Gerbert reintroduced into Europe had its length divided into 27 parts with 9 number symbols (this would exclude zero, which was represented by an empty column) and 1,000 characters in all, crafted out of animal horn by a shieldmaker of Rheims.[8][13][14] According to his pupil Richer, Gerbert could perform speedy calculations with his abacus that were extremely difficult for people in his day to think through in using only Roman numerals.[8] Due to Gerbert’s reintroduction, the abacus became widely used in Europe once again during the 11th century.[14]

Armillary sphere and sighting tube

Although lost to Europe since the terminus of the Greco-Roman era, Gerbert reintroduced the astronomical armillary sphere to Latin Europe via Al-Andalus in the late 10th century.[15][16] The details of Gerbert’s armillary sphere are revealed in letters from Gerbert to his former student and monk Remi of Trèves and to his colleague Constantine, the abbot of Micy, as well as the accounts of his former student and French nobleman Richer, who served as a monk in Rheims.[17] Richer stated that Gerbert discovered that stars coursed in an oblique direction across the night sky.[18] Richer described Gerbert’s use of the armillary sphere as a visual aid for teaching mathematics and astronomy in the classroom, as well as how Gerbert organized the rings and markings on his device:

An armillary sphere in a painting by Sandro Botticelli, c. 1480.

First [Gerbert] demonstrated the form of the world by a plain wooden sphere… thus expressing a very big thing by a little model. Slanting this sphere by its two poles on the horizon, he showed the northern constellations toward the upper pole and the southern toward the lower pole. He kept this position straight using a circle that the Greeks calledhorizon, the Latins limitans, because it divides visible stars from those that are not visible. On this horizon line, placed so as to demonstrate practically and plausibly… the rising and setting of the stars, he traced natural outlines to give a greater appearance of reality to the constellations… He divided a sphere in half, letting the tube represent the diameter, the one end representing the north pole, the other the south pole. Then he divided the semicircle from one pole to the other into thirty parts. Six lines drawn from the pole he drew a heavy ring to represent the arctic polar circle. Five divisions below this he placed another line to represent the tropic of Cancer. Four parts lower he drew a line for the equinoctial circle [the equator]. The remaining distance to the south pole is divided by the same dimensions.[18]

Given this account, historian Oscar G. Darlington asserts that Gerbert’s division by 60 degrees instead of 360 allowed the lateral lines of his sphere to equal to six degrees.[19] By this account, the polar circle on Gerbert’s sphere was located at 54 degrees, several degrees off from the actual 66° 33′.[19] His positioning of the Tropic of Cancer at 24 degree was nearly exact, while his positioning of the equator was correct by definition.[19] Richer also revealed how Gerbert made the planets more easily observable in his armillary sphere:

He succeeded equally in showing the paths of the planets when they come near or withdraw from the earth. He fashioned first an armillary sphere. He joined the two circles called by the Greeks coluri and by the Latins incidentes because they fell upon each other, and at their extremities he placed the poles. He drew with great art and accuracy, across the colures, five other circles called parallels, which, from one pole to the other, divided the half of the sphere into thirty parts. He put six of these thirty parts of the half-sphere between the pole and the first circle; five between the first and the second; from the second to the third, four; from the third to the fourth, four again; five from the fourth to the fifth; and from the fifth to the pole, six. On these five circles he placed obliquely the circles that the Greeks call loxos or zoe, the Latins obliques orvitalis (the zodiac) because it contained the figures of the animals ascribed to the planets. On the inside of this oblique circle he figured with an extraordinary art the orbits traversed by the planets, whose paths and heights he demonstrated perfectly to his pupils, as well as their respective distances.[20]

Richer wrote about another of Gerbert’s last armillary spheres, which had sighting tubes fixed on the axis of the hollow sphere that could observe the constellations, the forms of which he hung on iron and copper wires.[21] This armillary sphere was also described by Gerbert in a letter to his colleague Constantine.[22] Gerbert instructed Constantine that, if doubtful of the position of the pole star, he should fix the sighting tube of the armillary sphere into position to view the star he suspected was it, and if the star did not move out of sight, it was thus the pole star.[23] Furthermore, Gerbert instructed Constantine that the north pole could be measured with the upper and lower sighting tubes, the Arctic Circle through another tube, the Tropic of Cancer through another tube, the equator through another tube, and the Tropic of Capricorn through another tube.[23]

Gerbert in legend

Pope Sylvester II and the Devil in an illustration of c. 1460.

Gerbert was accused by his enemies of having studied magical arts and astrology at the Islamiccities of Córdoba and Seville and even at the University of Al Karaouine in Morocco.[24] This gave rise to legends that portray him as a sorcerer in league with the Devil.[25]

Gerbert was supposed to be in possession of a book of spells stolen from an Arab philosopher in Spain. Gerbert fled, pursued by the victim, who could trace the thief by the stars, but Gerbert was aware of the pursuit, and hid hanging from a wooden bridge, where, suspended between heaven and earth, he was invisible to the magician.[citation needed]

Gerbert was supposed to have built a brazen head. This “robotic” head would answer his questions with “yes” or “no”. He was also reputed to have had a pact with a female demon called Meridiana, who had appeared after he had been rejected by his earthly love, and with whose help he managed to ascend to the papal throne (another legend tells that he won the papacy playing dice with the Devil).[26]

According to the legend, Meridiana (or the bronze head) told Gerbert that if he should ever read a mass in Jerusalem, the Devil would come for him. Gerbert then cancelled a pilgrimage to Jerusalem, but when he read mass in the church Santa Croce in Gerusalemme (“Holy Cross of Jerusalem”) in Rome, he became sick soon afterwards and, dying, he asked his cardinals to cut up his body and scatter it across the city. In another version, he was even attacked by the Devil while he was reading the Mass, and the Devil mutilated him and gave his gouged-out eyes to demons to play with in the Church. Repenting, Sylvester II then cut off his hand and his tongue.

The inscription on Gerbert’s tomb reads in part Iste locus Silvestris membra sepulti venturo Domino conferet ad sonitum (“This place, at the advent of the Lord, will yield to the sound [of the last trumpet] the buried members of Sylvester II”, mis-read as “will make a sound”) and has given rise to the curious legend that his bones will rattle in that tomb just before the death of a Pope.[27]

The alleged story of the crown and papal legate authority given to Stephen I of Hungary by Sylvester in the year 1000 (hence the title ‘Apostolic King‘) is noted by the 19th-century historian Lewis L. Kropf as a possible forgery of the 17th century.[28] Likewise, the 20th-century historian Zoltan J. Kosztolnyik states that “it seems more than unlikely that Rome would have acted in fulfilling Stephen’s request for a crown without the support and approval of the Emperor.”[29]


12th century copy of De geometria.

Gerbert’s writings were printed in volume 139 of the Patrologia Latina. Darlington notes that Gerbert’s preservation of his letters might have been an effort of his to compile them into a textbook for his pupils that would illustrate proper letter writing.[19] His books on mathematics and astronomy were not research-oriented; his texts were primarily educational guides for his students.[19]

  • Mathematical writings
    • Libellus de numerorum divisione[30]
    • De geometria[30]
    • Regula de abaco computi[30]
    • Liber abaci[30]
    • Libellus de rationali et ratione uti[30]
  • Ecclesiastical writings
    • Sermo de informatione episcoporum
    • De corpore et sanguine Domini
    • Selecta e concil. Basol., Remens., Masom., etc.
  • Letters
    • Epistolae ante summum pontificatum scriptae
      • 218 letters, including letters to the emperor, the pope, and various bishops
    • Epistolae et decreta pontificia
      • 15 letters to various bishops, including Arnulf, and abbots
      • one dubious letter to Otto III.
      • five short poems
  • Other
    • Acta concilii Remensis ad S. Basolum
    • Leonis legati epistola ad Hugonem et Robertum reges

See also


  1. Jump up^ Morris Bishop (2001). The Middle Ages. p. 47.ISBN 9780618057030.
  2. Jump up^ Jana K. Schulman, ed. (2002). The Rise of the Medieval World, 500-1300: A Biographical Dictionary. p. 410. ISBN 9780313308178.
  3. Jump up^ Toby E. Huff (1993). The Rise of Early Modern Science: Islam, China and the West. p. 50. ISBN 9780521529945.
  4. Jump up^ Nancy Marie Brown, “The Abacus and the Cross: The Story of the Pope Who Brought the Light of Science to the Dark Ages”; see a presentation at
  5. Jump up^ Darlington (1947, p. 456, footnote 2).
  6. Jump up^ Mayfield, Betty. “Gerbert d’Aurillac and the March of Spain: A Convergence of Cultures”.
  7. Jump up^ Darlington (1947, p. 471).
  8. Jump up to:a b c Darlington (1947, p. 472).
  9. Jump up^ Salhab, 51.
  10. Jump up^ Darlington (1947, p. 473).
  11. Jump up^ Tester, 132.
  12. Jump up^ Seife (2000, p. 77): “He probably learned about the numerals during a visit to Spain and brought them back with him when he returned to Italy. But the version he learned did not have a zero.”
  13. Jump up^ Tester, 131–132.
  14. Jump up to:a b Buddhue, 266.
  15. Jump up^ Tester, 130–131, 156.
  16. Jump up^ Darlington (1947, pp. 467–472).
  17. Jump up^ Darlington (1947, pp. 464, 467–472).
  18. Jump up to:a b Darlington (1947, p. 467).
  19. Jump up to:a b c d e Darlington (1947, p. 468).
  20. Jump up^ Gerbert, 468–469.
  21. Jump up^ Darlington (1947, p. 469).
  22. Jump up^ Darlington (1947, pp. 469–470).
  23. Jump up to:a b Darlington (1947, p. 470).
  24. Jump up^ Bubnov dismisses as a fable the story that Gerbert travelled to Cordoba and says nothing of any further travels to Seville or Morocco. Nicolaus Bubnov, Gerberti, postea Silvestri II papae, Opera Mathematica (972–1003), Hildesheim, Georg Olms, 1963, reprint of the Berlin, 1899 edition, p. 383, n. 32. A more favorable evaluation of “the legends around Gerbert’s voyage to Spain” that grew from “a mere scrap of dubious source material” is given by Darlington (1947), see note 28.
  25. Jump up^ Kirsch, J.P. (1912). “Pope Sylvester II”The Catholic Encyclopedia. New York: Robert Appleton Company. Retrieved September 5, 2013
  26. Jump up^ Butler, E. M. (1948). The Myth of the Magus. Cambridge University Press. p. 157.
  27. Jump up^ Lanciani, Rodolfo (1892). “Papal Tombs”Pagan and Christian Rome. Boston: Houghton, Mifflin.
  28. Jump up^ Kropf, 290.
  29. Jump up^ Kosztolnyik, 35.
  30. Jump up to:a b c d e Darlington (1947, p. 468, footnote 43).


  • Buddhue, John Davis (1941). “The Origin of Our Numbers”. The Scientific Monthly 52 (3): 265–267.
  • Darlington, Oscar G. (1947). “Gerbert, the Teacher”. American Historical Review 52 (3): 456–476. doi:10.2307/1859882.JSTOR 1859882.
  • Kosztolnyik, Zoltan J. (1977). “The Relations of Four Eleventh-Century Hungarian Kings with Rome in the Light of Papal Letters”.Church History 46 (1): 33–47. doi:10.2307/3165157.
  • Kropf, Lewis L. (1898). “Pope Sylvester II and Stephen I of Hungary”. English Historical Review 13 (50): 290–295.doi:10.1093/ehr/XIII.L.290JSTOR 547228.
  • Salhab, Walid Amine (2006). The Knights Templar of the Middle East: The Hidden History of the Islamic Origins of Freemasonry. San Francisco: Red Wheel/Weiser. ISBN 1-57863-346-X.
  • Seife, Charles (2000). Zero: The Biography of a Dangerous Idea. New York: Penguin Books. ISBN 0-670-88457-X.
  • Tester, S. Jim (1987). A History of Western Astrology. Rochester: Boydell & Brewer. ISBN 0-85115-446-8.
  • Truitt, E. R. (2012). “Celestial Divination and Arabic Science in Twelfth-Century England: The History of Gerbert of Aurillac’s Talking Head”. Journal of the History of Ideas 73 (2): 201–222. doi:10.1353/jhi.2012.0016.

Further reading

  • Brown, Nancy Marie. The Abacus and the Cross: The Story of the Pope Who Brought the Light of Science to the Dark Ages (Basic Books; 2010) 310 pages; shows he was the leading scientist and mathematician of his day.
  • A translation of the letters of Gerbert (982–987) with introduction and notes, Harriet Pratt Lattin, tr., Columbus, OH, H. L. Hedrick, 1932.
  • Letters of Gerbert, with His Papal Privileges as Sylvester II, Translated with an introduction by Harriet Pratt Lattin, Columbia University Press (1961), ISBN 0-231-02201-8 ISBN 9780231022019
  • The Peasant Boy who Became Pope: Story of Gerbert, Harriet Pratt Lattin, Henry Schuman, 1951.
  • The Policy of Gerbert in the Election of Hugh Capet, 987: Based on a Study of His Letters, Harriet Pratt Lattin, Ohio State University, 1926.

External links

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