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Celestine II (born, CittĂ  di Castello, Umbria, or Macerata, Ancona [Italy]—died March 8, 1144) was the pope from 1143 to 1144. A scholar of noble birth, he studied under Peter AbĂ©lard, with whom he remained on friendly terms even after AbĂ©lard’s condemnation at the Council of Sens (1140). He was made cardinal deacon in 1127 by Pope Honorius II and cardinal priest (c. 1134) by Pope Innocent II, whom he was elected to succeed on...