William de Burgh, 3rd Earl of Ulster and 4th Baron of Connaught (English: də-BUR; 17 September 1312 – 6 June 1333) was an Irish noble who was Lieutenant of Ireland (1331) and whose murder, aged 20, led to the Burke Civil War.
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Background
The grandson of the 2nd Earl Richard Óg de Burgh via his second son, John, William de Burgh was also Lord of Connaught in Ireland, and held the manor of Clare, Suffolk.
He was summoned to Parliament from 10 December 1327 to 15 June 1328 by writs addressed to Willelmo de Burgh. He is considered the first Baron Burgh. In March 1331 he was appointed Lieutenant of Ireland, serving until November 1331.
Marriage and issue
The 3rd Earl of Ulster married, before 16 November 1327 (by a Papal Dispensation dated 1 May 1327), Maud of Lancaster, daughter of Henry, 3rd Earl of Lancaster and Maud Chaworth. They had one surviving child, Elizabeth, who was 13 months old when her father was murdered.
She married Lionel of Antwerp, third son of Edward III of England.
Maud remarried to Sir Ralph Ufford, Justiciar of Ireland 1344–46, and had further issue. She was said to have had great influence over her second husband.
