John de Burgh (died 1313)
John de Burgh was the son of Richard Óg de Burgh, 2nd Earl of Ulster, and Margaret de Burgh.
Heir apparent to the Earldom of Ulster, he married in Waltham Abbey, Essex, on 30 September 1308, Elizabeth de Clare, sister of Gilbert de Clare, 7th Earl of Hertford. She was the founder of Clare College, Cambridge, and a granddaughter of King Edward I of England. Gloucester in turn married John's sister Maud.
John and Elizabeth had one son:
However, John died in Galway the next year, leaving his infant son William heir to the Earldom.
