Pierre de France or Pierre Ier d' Alençon (born in 1251 in Holy Land - died the April 6th 1284 with Salerno, in Italy) was a prince of royal blood French, wire of holy Louis, king de France, and of Marguerite of Provence, which was count d' Alençon of 1269 with 1284, count de Blois, of Chartres and lord of Own way of 1272 with 1284.

It was born in Holy Land, while his/her father directed the Seventh crusade. He did not live the combat of Egypt, because with its birth, holy Louis had already negotiated peace with the new sultan of Egypt and dealt with reorganizing the Royaume of Jerusalem. Of return in France, he lived in Paris, until in 1269 when his/her father gave him in Apanage the Comté of Alençon.

He accompanied his father with Tunis during the Eighth crusade (1270), but this forwarding was a fiasco, because of the epidemic of dysentery which decimated the army of the crusaders. His/her father, as his/her brother Jean Tristan succumbed to the disease.

Of return in France, he married in 1272 Jeanne of Blois-Châtillon (1258 - † 1291), which brought to him the grounds of Blois, Chartres and Guise. They had two sons which did not live:

• Louis (1276 - † 1277)
• Philippe (1278 - † 1279)

In 1282, after the Sicilian Vespers, it went in the Royaume of Naples to carry help to his/her uncle Charles {{Ier}} of Anjou. He guerroya for the account of Charles, but died in Salerno in 1284. Its body was brought back to Paris, where it was buried. After its death without wire surviving, its prerogative of Alençon turned over to the Crown, its widow remaria not and sold in 1286 Chartres with Philippe IV Beautiful the. Blois and Guise passed then to a cousin of the family of Châtillon.