House of Blois chose a wife from the House of Champagne (Adela of Champagne) as a counterpoise to Angevin power. The senior line of the House of Blois became extinct with the death of Joan I of Navarre, wife of Philip IV of France, in 1305. Champagne and Navarre passed to the Capetian dynasty. King Stephen I of England, 1135–1154, was both a member of the House of Blois and the last Anglo-Norman King, being the grandson of William the Conqueror through his daughter Adela of Normandy. A branch of the family was established in Sancerre by Stephen I of Sancerre, a younger
Joan, Countess of Blois Peter of Alençon, a son of King Louis IX of France and Margaret of Provence. They had two sons who both died in infancy: Joan died in 1291, with no living issue. She left the title of Count of Blois and her remaining titles to her cousin Hugh. Joan, Countess of Blois Joan of Châtillon ("Jeanne de Blois"; 1253? – 19 or 29 January 1291) was Countess of Blois from 1280 to 1291, and Lady of Avesnes. She was the daughter of John I, Count of Blois and Alix of Brittany, Dame de Pontarcy. Joan received the County of Chartres