 The English had already hanged Seton's son whom they had held as a hostage.Seton's remaining two sons were also both killed - one drowning in a sea battle with an English fleet and the other was killed fighting Edward Balliol.His daughter, Margaret (who married Alan de Wyntoun, a paternal cadet of the Seton family), therefore succeeded to the estates and it was her son who took the Seton surname and was created the first Lord Seton.