Petrus Abaelardus or Abailardus or Pierre Abélard, 1079 – 21 April 1142
Medieval French scholastic philosopher, theologian, poet and composer. Не composed a hymnbook for the religious community, written after 1130, in that Abelard used completely new and homogeneous material. Only one melody from this hymnal survives, O quanta qualia. He also composed some celebrated love songs that are now lost.