John I de Balliol

John de Balliol (before 1208 – 1268) was an Anglo-Scottish baron of Barnard Castle. In 1223 he married Dervorguilla of Galloway, whose wealthy inheritance funded his career. On Henry III's instruction he served as a joint protector of the young Alexander III of Scotland and was a leading counsellor of Henry from 1258 to 1265.

Captured at the Battle of Lewes in 1264, he escaped and rejoined Henry. After a dispute with the bishop of Durham, he supported scholars at Oxford from around 1263; Dervorguilla's later endowments helped establish Balliol College. He died in 1268; his son John was chosen king of Scots in 1292.