Pierre d'Ailly
French theologian and astrologer / From Wikipedia, the free encyclopedia
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"Aliacensis" redirects here. For the lunar crater, see Aliacensis (crater).
Pierre d'Ailly (French: [d‿aji]; Latin Petrus Aliacensis, Petrus de Alliaco; 1351 – 9 August 1420) was a French theologian, astrologer and cardinal of the Roman Catholic Church.