Soon after the Norman conquest most of the land was transferred to the new Breton–Norman aristocracy, with the lion's share going to Robert, Count of Mortain, half-brother of King William and the largest landholder in England after the king with his stronghold at Trematon Castle near the mouth of the Tamar. Cornwall and Devon west of Dartmoor showed a very different type of settlement pattern from that of Saxon Wessex and places continued, even after 1066, to be named in the Celtic Cornish tradition with Saxon architecture being uncommon.