Jean Maugier, Maugerii, of the diocese of Rouen, was master of arts in 1403 and bachelor of canon law, and licentiate in law but not in theology.

He was born about 1370 and was received as canon of Rouen in 1421 in place of Jean Porcher, who remained faithful to France. He held, from 1423 on, a general commission to prosecute all trials relative to the Church.

He was a deputy to the Estates of Paris in 1424, pénitencier of the church of Rouen in 143-2, vicar of Pontoise in 1436. He must have died before June 11, 1440

In his consultation on the subject of the Twelve Articles, Jean Maugier asserted always his readiness to accomplish the good pleasure of Pierre Cauchon. We find that he gave two houses to the Chapter of Rouen.