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
Blois family house standing in of historic parkland, dating from the 16th century. Lady Catherine Grey, sister of Lady Jane Grey, was imprisoned at Cockfield Hall in 1567 to recover from her privations in the Tower of London but died shortly after her arrival and was buried in the Cockfield Chapel in Yoxford church. The family remain patrons of Blythburgh church, and the current head of the Blois family is still major landowner in north-east Suffolk. Sir Charles Blois however no longer owns Cockfield Hall. Although the family have lived in the region for several decades they were not given the estate