They had a son named William Donn age 707.
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Heir apparent to the Earldom of Ulster, he married (as her first husband) in Waltham Abbey, Essex, on September 30, 1308, Elizabeth de Clare.
John and Elizabeth had one son:
William Donn de Burgh, 3rd Earl of Ulster (1312–1333)
However, he died in Galway the next year, leaving his infant son William heir apparent to the Earldom.