Pierre Cochon was a notary of Rouen.

He was clerk of wills in 1426, and describes himself in his chronicles in 1425 as priest and notary. He was already in Rouen in 1406 and was still living in that city on July 29, 1430; he was present at the entry of little King Henry VI.

Pierre Cochon was born at Fontaine le Dun in the viscounty of Arques. But his father, Jean Cochon, was a burgess of Rouen. In 1433, still at Rouen, Pierre took part, in company with Guillaume Manchon, in a riot caused by clerics arrested by the King's sergeant, and he was arrested as the ringleader.

In 1435, with Manchon, he authenticated Bedford's will. In 1437 we see that he was present at the blessing of the chapel of the Close Saint Marc, founded by his colleague Guillaume Le Cars, and that he acquired from the brotherhood of notaries in 1438 sixty sous as income on a house in the rue Fils-Guy.

The following year he took his income to the provost and brother notaries. On April 1, 1437, he is cited as curé of Vitefleur and founded his memorial masses at the Confrèrie.

Jacques Cochon, his brother and heir, priest and curé of Granville la Teinturière, approved this foundation on September 21, 1440. In 1446 Pierre Cochon is still clerk of wills "under Maistre Guillaume de Désert," one of Jeanne's judges who is cited as being master of intestates; and in 1448 Pierre is named as his secretary.

Pierre Cochon died on February 22, 1449, and was buried in the cemetery of Saint Étienne le Grand, a church appertaining to the cathedral.