He is venerated in the Catholic Church as a blessed, having been beatified by Pope Clement VII, 140 years after his death.

[3] Pierre was descended from nobles who secured his entrance into the priesthood when he started to serve in several places as a canon before he was named as the Bishop of Metz and a pseudocardinal under an antipope.

[3] His efforts were in vain and he was soon driven from Metz but moved to southern France where he died as a result of his harsh self-imposed penances.

His parents died during his childhood (father when he was two and mother when he was four) which prompted his aunt Jeanne - the countess of Orgières - to raise him in Paris.

Hearing this, Richard II invited him to remain at his court, but Pierre returned to Paris to pursue his vocation to the priesthood.

The antipope named Pierre as Bishop of Metz in 1384 and he was enthroned there that September entering barefoot on a mule.

About this time Pope Urban VI named Tilman Vuss de Bettenburg as the legitimate Bishop of Metz.

[7] On 16 March 1395, his brother Jean ordered the construction of a church dedicated to the sainted Pope Celestine V and Pierre's remains were transferred there.

In 1629 Pope Urban VIII allowed the Carthusians to celebrate a Mass and the Divine Office in his name.