John de Burgh
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John de Burgh (1286 – 18 June 1313) was the son of Richard Og de Burgh, 2nd Earl of Ulster and Margaret de Burgh.
Heir apparent to the Earldom of Ulster, he married Elizabeth de Clare, sister of Earl of Gloucester and Hertford in Waltham Abbey, Essex on September 30, 1308; Gloucester in turn married John's sister Matilda.
John and Elizabeth had one son:
- William Donn de Burgh, 3rd Earl of Ulster (1312–1333)
However, he was murdered in Galway by his own retainers the next year, leaving his infant son William heir apparent to the Earldom.