Louis I of Châtillon, count of Blois (d. 1346)
Eldest son of Guy I of Châtillon, count of Blois, and Margaret of Valois, sister of King Philip VI of Valois. He was the younger brother of Charles of Blois, duke of Brittany. Louis was count of Blois and Soisson from 1342 to his death in 1346. He married Jeanne of Hainault, daughter of John of Hainault, lord of Beaumont, in 1336. He was succeeded as count of Blois by his three sons, Louis II, John II and Guy II. He was killed in the Battle of Crécy on 26 August 1346.
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