In 1409, however, he took part in the attempt to reconcile the factions at the Council of Pisa.
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Fillastre took a very important part in the Council of Constance, where he and Cardinal d'Ailly were the first to agitate the question of the abdication of the rival claimants (February, 1415).
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After graduating as doctor juris utriusque, Fillastre taught jurisprudence at Reims, and in 1392 was appointed dean of its metropolitan chapter.
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