C. Philipp E. Nothaft is a research fellow at The Warburg Institute, London. He has published widely on the history of time, astronomy, and calendars from late antiquity to the early modern period, including the monograph Dating the Passion (Brill, 2012).

• Table of ContentsPREFACELIST OF PLATESABBREVIATIONSSIGNS USED IN THE CRITICAL APPARATUSINTRODUCTIONCHAPTER ONE: CONTEXTS AND PRETEXTS1.The Jewish calendar: history and structure2.The Easter computus and the challenge of calendar reform3.The Christian encounter with the Jewish calendar: antiquity to twelfth centuryCHAPTER TWO: THE ANONYMOUS LIBER ERARUM1.Structure and contents2.Origin and date3.The manuscripts4.The editionLIBER ERARUMTHE BOOK OF ERASCHAPTER THREE: ROBERT OF LEICESTER’S TREATISE ON THE HEBREW CALENDAR (1294)1.Franciscan Hebraism and the challenge of biblical chronology2.Manuscripts, date, and authorship3.Structure and contents4.The editionROBERTUS DE LEYCESTRIA: TRACTATUS DE COMPOTO HEBREORUM APTATO AD KALENDARIUMROBERT OF LEICESTER: TREATISE ON THE COMPUTUS OF THE HEBREWS AND ITS ADAPTATION TO OUR CALENDARCHAPTER FOUR: NICHOLAS TREVET’S COMPOTUS HEBREORUM (1310)1.Introduction2.Context, contents, and sources3.The editionNICOLAUS TREVET: COMPOTUS HEBREORUMNICHOLAS TREVET: ON THE COMPUTUS OF THE HEBREWSCHAPTER FIVE: THE COMPUTUS IUDAICUS OF 13421.Introduction2.The manuscripts3.Structure and contents4.Context and transmission5.Transliteration of Hebrew terms6.The tables7.Major textual changes8.The commentaries9.Authorship and date10.The users11.The editionCOMPUTUS JUDAICUSON THE JEWISH COMPUTUSCOMMENTARIUS IN COMPUTUM JUDAICUMCOMMENTARY ON THE ‘JEWISH COMPUTUS’CHAPTER SIX: HERMANN ZOEST’S CALENDARIUM HEBRAICUM NOVUM (1436)1.The Jewish calendar in the work of Hermann Zoest2.Calendarium Hebraicum novum: structure and contents3.The manuscripts4.The editionHERMANNUS ZOESTIUS: CALENDARIUM HEBRAICUM NOVUMHERMANN ZOEST: A NEW HEBREW CALENDAR5.Chronological commentary on Hermann’s CalendariumAPPENDIX I: JOHN OF PULCHRO RIVO ON THE JEWISH CALENDARAPPENDIX II: NOTES ON FURTHER TEXTS AND MANUSCRIPTSBIBLIOGRAPHY