Pierre D'ailly

He was born in Compiègne . He was chancellor of the University Of Paris from 1385 to 1395 . He was involved in the effort to end the Great Schism by means of an Ecumenical Council and participated in both the Council Of Pisa ( 1409 ) and the Council Of Constance ( 1414 - 1418 ) which condemned the Bohemia n reformer Jan Hus . He was a lifelong friend and mentor to Jean Gerson .

D'Ailly's ''Imago Mundi'', a work of cosmography, influenced Christopher Columbus in his estimates of the size of world land-mass.

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