Career
His refusal to give up his beliefs regarding the Immaculate Conception resulted in his condemnation and clandestine exile to Spain. He joined the Dominicans probably in Valencia. In 1383 he was lecturing on theology at Valencia Cathedral.
Thence he went to Paris, taught in the convent of Saint James there, and obtained the mastership of theology in 1387.
Here he entered the field of controversy on the question of the Immaculate Conception, which was not then defined. Maintaining the proposition that the Blessed Virgin was conceived without sin was heretical, he aroused against him the faculty of the University of Paris.
The faculty issued letters condemnatory of Montson"s errors and conduct, which Denifle conjectures, from their acerbity of speech, were written by Pierre d"Ailly. Denifle also says Montson would not have been condemned had he not declared the doctrine of the Immaculate Conception heretical.
Montesono appealed to Pope Clement VIII, who cited him and the university faculty to Avignon.
There and in Spain, whither he afterwards returned, he filled several important positions.
