William de Burgh, 3rd Earl of Ulster, known as “The Brown Earl”, is assassinated in 1333 by his own knights — John de Logan and two members of the de Mandeville family — at Le Ford, near Belfast. His murder was the result of intense rivalries and intrigue among the Norman-Irish lords, and it triggered a period of political instability in Ulster. The power vacuum following his death ultimately contributed to the decline of Norman control in parts of Ireland.