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 with fresh troops from London. In the subsequent battle the Empress's forces were defeated and Robert of Gloucester himself was taken prisoner. Further negotiations attempted to deliver a general peace agreement but Queen Matilda was unwilling to offer any compromise to the Empress, and Robert refused to accept any offer to encourage him to change sides to Stephen. Instead, in November the two sides simply exchanged Robert and the King, with Stephen releasing Robert on 1 November 1141. Stephen began re-establishing his authority. Henry held another church council, which this time reaffirmed Stephen's legitimacy to rule, and a fresh coronation