https://en.wikipedia.org/wiki/William_Donn_de_Burgh,_3rd_Earl_of_Ulster
William de Burgh, 3rd Earl of Ulster and 4th Baron of Connaught (English: /dˈbɜːr/; d’-BER; 17 September 1312 – 6 June 1333) was an Irish noble who was Lieutenant of Ireland (1331) and whose murder, aged 20, led to the...