The county of Perche was a medieval county lying between Normandy and Maine.
It was held by a continuous line of counts until 1226. One of these, Geoffroy III, would have been a leader of the Fourth Crusade had he not died before the assembled forces could depart. The county then became a possession of the crown, which removed part of it to create the county of Alençon.
Jean II of Alençon (Jean II d’Alençon) (2 March 1409 – 8 September 1476) was a French nobleman. He succeeded his father as Duke of Alençon and Count of Perche as a minor in 1415, after the latter's death at the Battle of Agincourt. He is best known as a general in the last phase of the Hundred Years' War and for his role as a comrade-in-arms of Joan of Arc.