Jean Duchemin or Du Quemin, de Quemenio, was a licentiate in law at Paris in March, 1428.

He studied under Thomas Fiesvet, one of Jeanne's judges, and was a friend of Jean Jolivet.
He was a lawyer at the court of Rouen, and in 1432 figures as lawyer in the church court at Rouen at a trial.
Jean Duchemin was designated by the Chapter to assist at the election of an archbishop in 1436.

We find, in 1428, a Jacques Duchemin commissioned by the vicomte du Pont de Larche to examine Pierre Le Bigordoys, "traitor, thief and enemy of the King."