the limbs of buried Sylvester II, at the advent of the Lord", 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. The story of the crown and papal legate authority allegedly 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. 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." Honours Hungary issued a commemorative stamp honouring Pope Sylvester II on 1 January 1938, and France honoured him in 1964 by issuing a postage stamp. Works 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. His books on mathematics and astronomy were not research-oriented; his texts were primarily educational guides for his students. Mathematical writings Libellus de numerorum divisione De geometria Regula de abaco computi Liber abaci Libellus de rationali et ratione uti 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 abbots and bishops, including Arnulf) a dubious letter to Otto III five short poems Other writings Acta concilii Remensis ad S. Basolum Leonis legati epistola ad Hugonem et Robertum reges Celebacy for the guarantee of our future In popular culture Gerbert D'Aurillac appears as an adversary in Deborah Harkness' novel series called the All Souls Trilogy. He is portrayed by Trevor Eve in the trilogy's television adaptation. Gerbert d'Aurillac is the protagonist of Judith Tarr's 1989 novel Ars Magica. See also List of Roman Catholic scientist–clerics Barcelona astrolabe Notes References Citations Bibliography 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, A translation of the letters of Gerbert (982–987) with introduction