William de Burgh, 3rd Earl of Ulster and 4th Baron of Connaught was an Irish noble who was Lieutenant of Ireland (1331) and whose murder, aged 20, led to the Burke Civil War.

Richard Óg de Burgh, 2nd Earl of Ulster and 3rd Baron of Connaught, called The Red Earl, was one of the most powerful Irish nobles of the late 13th and early 14th centuries and father of Elizabeth, wife of King Robert the Bruce of Scotland.