text: In 1223, Lord John married Dervorguilla of Galloway, the daughter of Alan, Lord of Galloway and Margaret of Huntingdon. By the mid-thirteenth century, his wife had become very wealthy, principally as a result of inheritances from her family. This wealth allowed Balliol to play a prominent public role, and, on King Henry III's instruction, he served as joint protector of the young king of Scots, Alexander III. He was one of Henry III's leading counsellors between 1258 and 1265. and was appointed Sheriff of Nottinghamshire and Derbyshire from 1261 to 1262. He was captured at the Battle of Lewes in 1264, but escaped and rejoined King Henry.
  In 1265 Thomas de Musgrave owed him a debt of 123 marks. About 1266, Baldwin Wake owed him a debt of 100 marks and more.
  Following a dispute with the Bishop of Durham, he agreed to provide funds for scholars studying at Oxford. Support for a house of students began in around 1263; further endowments, made after his death by Dervorguilla, resulted in the establishment of Balliol College.
  Issue
  John and Dervorguilla had issue:
  Sir Hugh de Balliol, who died without issue before 10 April 1271. He married Agnes de Valence, daughter of William de Valence, 1st Earl of Pembroke.
  Alan de Balliol, who died before 10 April 1271 without issue
  Sir Alexander de Balliol, who died without issue before 13 November 1278. He married Eleanor de Genoure.
  King John I of Scotland, successful competitor for the Crown in 1292