| Peter | Abelard | French philosopher, theologian, teacher and poet. |
| Abubakr | Ahmad | General Secretary of the all India Sunni Jamiyyathul Ulama. |
| Dante | Alighiere | Italian poet, prose writer, literary theorist, moral philosopher. |
| William | Alnwick | An English Catholic clergyman. |
| Ayyub | Al-Ruhawi | A 9th century Arab physician. |
| Arnald | Amalaricus | Bishop pf Citeaux. |
| Robertus | Angelicus | 12th century Arabist and theologian. |
| Jean d' | Anneaux | Doctor of theology in Paris. |
| Thomas | Aquinas | Italian philosopher. |
| Honorius | Augustodunensis | 12th century Christian theologian. |
| Decimus | Ausonius | Roman poet and teacher of rhetoric from Burdigala in Aquitaine. |
| Roger | Bacon | English philosopher. |
| William | Bloc | A bachelor. |
| Jean | Buridan | French philosopher. |
| Joseph ben | Caiaphas | Jewish highest priest. |
| Petrus | Cantor | French theologian. |
| John | Chrysostom | Served as archbishop of Constantinople. |
| Angelus | Clarenus | Founder and leader of one of the groups of Fraticelli. |
| Giovanne | Collona | Roman Catholic cardinal during the Avignon papacy. |
| Giovanni | Dalbena | An inquisitor of Narbonne. |
| Pierre | de Arrablay | French theologian, cardinal and advocate of church reform. |
| Bernard | Delicieux | A Spiritual Franciscan friar. |
| Fra | Dolcino | Second leader of the Dulcinian reformist movement. |
| Guillaume | Durand | French journalist. |
| Helius | Eobanus | German Latin poet. |
| Jacques | Fournier | Former head of the Catholic Church. Aka: Pope Benedict XII. |
| Bernard | Gui | A Dominican friar, Bishop of Lodeve and papal inquisitor. |
| Alhazen | Hasan | Muslim Arab mathematician, astronomer of the Islamic Golden Age. |
| Genghis | Khan | Founder and first Great Khan of the Mongol Empire. |
| Marcus | Lucanus | Roman poet. Known in English as Lucan. |
| Albertus | Magnus | German Catholic Dominican friar, philosopher and bishop. |
| Walter | Map | A medieval writer. A courier of King Henry II of England. |
| Rabanus | Maurus | Frankish Benedictine monk. |
| Pierre | Olieu | Preached the prophesies of Joachim. |
| Giambattista | Orsini | Italian Roman Catholic cardinal and served as papal legate. |
| Bertrand del | Pogetto | French papal diplomat and cardinal. |
| Michael | Psellus | Byzantine writer. |
| Louis | Savory | A writer. |
| Gherardo | Segarelli | Founder of the Apostolic Brethren. |
| Sulpicius | Severus | Christian writer and native of Aquitania. |
| Aelius | Spartianus | One of the supposed authors of Historia Augusta. |
| Publius | Statius | Roman poet of the 1st century AD. |
| Paolo | Zoppo | A hermit who lived in the forest of Reith. |
| Adelard of Bath | | 12th century English natural philosopher. |
| Adelmo of Otranto | | A monk who is the library's manuscript scholar. |
| Adso | | An old man living in a German monastery. |
| Agnes of Rome | | A virgin martyr, venerated as a saint in the Roman Catholic Church. |
| Alanus de Insulis | | French theologian. |
| Aldhelm | | Bishop of Sherborne, writer and scholar of Latin poetry. |
| Alinardo of Grottaferrata | | An oldest monk. |
| Ambrose | | Roman composer. |
| Angela of Foligno | | Italian Franciscan tertiary known as mystic from her writings. |
| Apuleius | | Latin-language prose writer. |
| Aristotle | | Greek philosopher. |
| Artemidorus | | A professional diviner who lived in the 2nd century AD. |
| Augustine of Hippo | | A theologian, philosopher and bishop of Hippo. |
| Aymaro of Alessandria | | A gossipy, sneering monk. |
| Bartholomew | | One of the twelve apostles of Jesus. |
| Basil of Ancyra | | A Christian priest in Ancyra, Galatia during the 4th century. |
| Beatus of Liebana | | A monk, theologian and geographer. |
| Benedict XI | | Former Pope. Head of the Catholic Church. |
| Benno of Uppsala | | Scandinavian monk. Assistant librarian after Berengar's death. |
| Bentivenga of Gubbio | | Member of the Apostles before he became a friar. |
| Berengar of Arundel | | Assistant librarian. |
| Bishop Obizzo | | A bishop of Parma. |
| Boethius | | Roman senator, consul, magister officiorum and philosopher. |
| Bonagratia of Bergamo | | Franciscan layman of the 14th century. |
| Bonaventure of Bagnoregio | | Italian philosopher. |
| Boniface VIII | | Former Pope. Ruler of the Papal States. |
| Brunellus | | Abbotts favorite horse. |
| Bruno of Cologne | | Founder of the Carthusian Order. |
| Charles the Bald | | The 9th century King of West Francia, King of Italy. |
| Clare of Montefalco | | Augustinian nun and abbess. |
| Clement of Alessandria | | Christian theologian and philosopher. |
| Constantine the Great | | Made Christianity the main religion in Rome. |
| Cyprian | | Bishop of Carthage and a notable Christian writer. |
| Diotisalvi of Florence | | Probable architect of the circular Romanesque baptistery at Pisa. |
| Emperor Hadrian | | Roman emperor. |
| Emperor Louis | | King of the Franks. |
| Frederick II | | King of Sicily, Germany, Italy and Holy Roman Emperor. |
| Geoffrey of Carcassonne | | The inquisitor. |
| Gerard of Borgo | | Italian friar. |
| Heloise | | A French nun, philosopher, writer, scholar and abbess. |
| Hildebert | | French ecclesiastic, hagiographer and theologian. |
| Hugh of New Castle | | Franciscan theologian. |
| Hugh of Saint Victor | | Leading theologian and writer on mystical theology. |
| Isidore of Seville | | Spanish historian. |
| James the Great | | One of the twelve apostles of Jesus. |
| Joachim of Fiore | | Italian Christian theologian. |
| John of Jandun | | French philosopher. |
| John of Salisbury | | English author, philosopher, educationalist and bishop of Chartres. |
| John XXII | | Head of the Catholic Church. Former Pope. |
| Jorge de Burgos | | An elderly blind monk. |
| King Lysimachus | | Macedonian general and successor of Alexander the Great. |
| Magnus of Iona | | One of the monks. |
| Malachi of Hildesheism | | The librarian in the abbey. |
| Margaret of Castello | | Italian professed member of the Third Order of Saint Dominic. |
| Margaret of Trent | | The companion of Fra Dolcino of Novara. |
| Mark of Cornwall | | King of Kernow in the early 6th century. |
| Marsilius of Padua | | Italian scholar. He was an important 14th century political figure. |
| Master Jerome | | Bishop of Kaffa. |
| Melchizedek | | The King of Salem and priest of El Elyon. |
| Michael of Cesena | | Italian theologian. |
| Nicholas of Flue | | The patron saint of Switzerland. |
| Nicholas of Morimondo | | Master glazier of the abbey. |
| Pacificus of Tivoli | | a monk who knows a pagan poet very well. |
| Patrick of Clonmacnois | | One of the monks. |
| Paulinus of Nola | | Roman poet, writer, and senator |
| Peter in Rome | | One of the twelve apostles of Jesus Christ. |
| Peter of Hermit | | A priest of Amiens and a key figure during the People's Crusade. |
| Peter of Murrone | | Ruler of the Papal States for five months. |
| Peter of Sant' Albano | | Served as cardinal of Albano. |
| Philip IV of France | | King of France from 1285 to1314. |
| Pierre de Maricourt | | 13th century French scholar conducted experiments on magnetism. |
| Pliny the Younger | | A lawyer, author, and magistrate of Ancient Rome. |
| Pope Clement V | | Former head of the Catholic Church. |
| Pope Clement VII | | Former Pope. Ruler of the Papal States. |
| Pope Gregory X | | Former head of the Catholic Church. |
| Pope Innocent III | | Former head of the Catholic Church. |
| Pope John VIII | | Former bishop of Rome. |
| Pope Nicholas II | | Former head of the Catholic Church. aka: Gerard of Burgundy. |
| Pope Nicholas V | | Former head of the Catholic Church. |
| Pope Sylvester I | | Former bishop of Rome. |
| Queen Helena | | The mother of Roman emperor Constantine the Great. |
| Rabano of Toledo | | One of the monks. |
| Raymond de Gaufredi | | Minister general of the
Franciscan. |
| Remigio of Varagine | | The cellarer of the monastery. |
| Robert of Bobbio | | Former librarian. |
| Robert the Wise | | King of Naples. |
| Roger of Hereford | | A medieval astronomer, astrologer, alchemist and mathematician. |
| Saint Adalbert | | Bohemian missionary and Christian saint. |
| Saint Andrew | | Apostle of Jesus. |
| Saint Anne | | The mother of Mary and the maternal grandmother of Jesus. |
| Saint Benedict | | Founder of the Benedictine monastery at Monte Cassino. |
| Saint Brendan | | One of the early Irish monastic saints. |
| Saint Columba | | Irish abbot and missionary evangelist. |
| Saint Dominic | | Castilian Catholic priest and founder of the Dominican Order. |
| Saint Ephrem | | Prominent Christian theologian and writer. |
| Saint Francis of Assissi | | An Italian Catholic friar, deacon, mystic and preacher. |
| Saint Hildegard | | German Benedictine abbess, writer, philosopher and polymath. |
| Saint Jerome | | A Latin priest, confessor, theologian and historian. |
| Saint John de Evangelist | | The name traditionally given to the author of the Gospel of John. |
| Saint Joseph | | In the canonical gospels, he was the legal father of Jesus. |
| Saint Lawence | | One of the seven deacons of the city of Rome,Italy. |
| Saint Matthew | | One of the twelve apostles of Jesus. |
| Saint Maurus | | The first disciple of Saint Benedict of Nursia. |
| Saint Pachomius | | Founder of Christian cenobitic monasticism. |
| Saint Stephen | | A deacon in the early church at Jerusalem. |
| Salvatore of Montferrat | | Assistant of Remigio of Varagine. |
| Salvinus of the Armati | | Italian inventor credited with the development of eyeglasses. |
| Severinus of Sankt | | In charge of the infirmary where he worked as the abbey herbalist. |
| Simone of Touraine | | One of the provincial ministers. |
| Solomon | | King of Israel. |
| Stephen of Bourbon | | A preacher of the Dominican Order. |
| Sylvester II | | French scholar served as the Bishop of Rome. |
| Synesius | | Greek bishop of Ptolemais in ancient Libya. |
| Thomas of Bologna | | One of the provincial ministers . |
| Trajan | | Roman emperor. |
| Tyconius | | African Donatist writer. |
| Ubertino of Casale | | Leader of Franciscan spirituals. |
| Venantius of Salvemec | | Translator who worked in the scriptorium. |
| Vincent of Beauvais | | A Dominican friar at the Cistercian monastery. |
| Virgil of Toulouse | | A rhetorician. |
| Waldo of Hereford | | One of the monks. |
| William of Baskerville | | Franciscan friar. |
| William of Moerbeke | | Translator of philosophical and scientific texts from Greek to Latin. |
| William of Ockham | | English philosopher. |
