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
Stephen, King of England that the King should hand over the royal castles in Normandy to Matilda whilst he was still alive and insist on the Norman nobility swearing immediate allegiance to her, thereby giving the couple a much more powerful position after Henry's death. Henry angrily declined to do so, probably out of a concern that Geoffrey would try to seize power in Normandy somewhat earlier than intended. A fresh rebellion broke out in southern Normandy, and Geoffrey and Matilda intervened militarily on behalf of the rebels. In the middle of this confrontation, Henry unexpectedly fell ill and died near Lyons-la-Forêt. Stephen was