Background
Elizabeth was born at Carrickfergus Castle near Belfast, Ireland, the only child of William Donn de Burgh, 3rd Earl of Ulster and Maud of Lancaster, Countess of Ulster.
Elizabeth was born at Carrickfergus Castle near Belfast, Ireland, the only child of William Donn de Burgh, 3rd Earl of Ulster and Maud of Lancaster, Countess of Ulster.
She was the last of the senior legitimate line of the descendants of William de Burgh.