Nicolas Le Roux, Ruffi, Benedictine, of a noble family of Rouen, entered the abbey of Jumièges towards 1395.

He studied in Paris where he is mentioned as a bachelor of law in 1403; he received his doctorate in law in 1411. Ambassador to the councils of Pisa, Rome and Constance, this "worthy doctor" was recommended by the University to the Pope, to be named abbot of La Croix Saint Leufroy in 1412, and then abbot of Jumièges on September 28, 1418.

He is to be found among the regents of the Faculty of Law in Paris in 1419, with Jean Garin and Raoul Roussel. He took the oath of loyalty to Henry V in 1420, and died (June 17, 1431) shortly after Jeanne d'Arc was burned at the stake.

He left a personal fortune Of 32,000 livres which his relatives took away from the religious community of Jumièges although this sum had been reserved in accordance with his intentions for the restoration of that celebrated monastery, which had been greatly damaged by the war.

Nicolas Le Roux had greatly cherished that abbey and he had attempted to reëstablish there the observance of the rules of the order. Le Roux had the reputation of a good administrator and that of a man of good character. He played only a secondary part in Jeanne's trial, and agreed entirely with the University.