Peter I (died 1283), received the county of Alençon and part of the county of Perche in appanage from his father Louis IX of France
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His son, Jean, 2nd Duc d'Alençon (who features in Shakespeare's Henry VI), was dispossessed of his duchy in the Battle of Verneuil, August 17, 1424: the Duke was defeated and taken prisoner by English forces led by John, Duke of Bedford.
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A third house of Alençon counts descended from Charles, second son of the Count of Valois, who was killed at the Battle of Crécy in 1346.
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Jean de Carrouges a vassal of Pierre II, Count of Alençon, became famous as one of the combatants in the last judicial duel to be permitted in France, in 1386.