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    Sylvester II, 1st French Pope  
Pope Sylvester II, born Gerbert d'Aurillac, was a prolific scholar, teacher, and Pope. He endorsed and promoted study of Arab/Greco-Roman arithmetic, mathematics, and astronomy, reintroducing to Europe the abacus and armillary sphere, which...
 
    Guido d'Arezzo, Iventor Musical Notation  
Guido of Arezzo (991/992 – after 1033) was a music theorist of the Medieval era. He is regarded as the inventor of modern musical notation (staff notation) that replaced neumatic notation; his text, the Micrologus, was the second-most-widel...
 
    Roger I, Norman Conqueror of Sicily  
Roger I (Roger Guiscard), c.1031-1101, Norman conqueror of Sicily; son of Tancred de Hauteville. He went to Italy in 1058 to join his brother, Robert Guiscard, in conquering Apulia and Calabria from the Byzantines. Between 1061 and 1091 he...
 
    Pope John XIX  
John XIX (born ? in Rome, died October 1032), was Pope from 1024 to 1032. He succeeded his brother, Pope Benedict VIII (1012–24), both being members of the powerful house of Tusculum. When elected Pope John XIX he was an unordained layman....
 
    Anselm of Canterbury, Founder Scholasticism  
Anselm of Canterbury was a Benedictine monk, an Italian medieval philosopher, theologian, and church official who held the office of Archbishop of Canterbury from 1093 to 1109. Called the founder of scholasticism, he is famous as the origin...
 
    Pope Urban II, Crusade Instigator  
Urban is best known for starting the First Crusade. Urban's crusading movement took its first public shape at the Council of Piacenza, where in March 1095 Urban received an ambassador from the Byzantine emperor Alexius I Comnenus, asking fo...
 
    Roger II, King of Sicily  
Roger II was King of Sicily, son of Roger I of Sicily and successor to his brother Simon. He began his rule as Count of Sicily in 1105, later became Duke of Apulia and Calabria (1127), then King of Sicily (1130). It is Roger II's distinctio...
 
    Gregory VIII, Pope for only 57 Days  
Pope Gregory VIII died in Pisa on December 17, 1187, of a fever, after holding the Papacy for only 57 days. On October 21, 1187, the day after the death of Pope Urban III, Alberto di Morra was elected pope and took the name Gregory VIII, in...
 
    Enrico Dandolo, Doge of Venice  
Enrico Dandolo was the 41st Doge of Venice from 1195 until his death. Remembered for his blindness, piety, longevity, and shrewdness, he is infamous for his role in the Fourth Crusade which he, at age ninety, directed against the Byzantine...
 
    Pope Innocent III  
Pope Innocent III was Pope from 8 January 1198 until his death. His birth name was Lotario dei Conti di Segni, sometimes anglicised to Lothar of Segni. Pope Innocent was one of the most powerful and influential popes in the history of the p...
 
    Pope Gregory IX, Papal Inquisition  
Gregory IX, Pope 1227-1241, who founded the papal Inquisition. In 1227 he excommunicated Frederick II when the emperor delayed in keeping his pledge to lead a Crusade. Gregory ordered an attack on the kingdom of Sicily in the emperor's abse...
 
    Fibonacci, Hindu-Arabic Numeral System  
Leonardo Pisano Bigollo or simply Fibonacci, was an Italian mathematician, considered by some "the most talented western mathematician of the Middle Ages." Fibonacci is best known to the modern world for the spreading of the Hindu-Arabic nu...
 
    Otto IV of Brunswick, Holy Roman Emperor  
Otto IV of Brunswick was one of two rival kings of the Holy Roman Empire from 1198 on, sole king from 1208 on, and emperor from 1209 on. The only king of the Welf dynasty, he incurred the wrath of Pope Innocent III and was excommunicated in...
 
    Saint Francis of Assisi, Founder Franciscans  
Saint Francis of Assisi was an Italian Catholic friar and preacher. He founded the men's Order of Friars Minor, the women’s Order of St. Clare, and the Third Order of Saint Francis for men and women not able to live the lives of itinerant p...
 
    St. Albert the Great, Albertus Magnus  
Albertus Magnus, also known as Saint Albert the Great and Albert of Cologne, was a Dominican friar who achieved fame for his comprehensive knowledge of and advocacy for the peaceful coexistence of science and religion. He is considered to b...
 
       
 
         
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