William de Burgh

William de Burgh (c. 1160 - winter 1205/1206) was the founder of the de Burgh/Burke/Bourke dynasty in Ireland.

He arrived in Ireland in 1185 and was closely associated with Prince John.

King Henry II of England appointed him Governor of Limerick and granted him vast estates in Leinster and Munster. De Burgh's castles at Tibberaghny (County Kilkenny), Kilsheelan, Ardpatrick and Kilfeacle were used to protect King John's northern borders of Waterford and Lismore and his castles at Carrigogunnell and Castleconnell were used to protect Limerick. He was Seneschal of Munster (Royal Governor) from 1201 to 1203.

Sometime in the 1190s, William allied with the King of Thomond, either Domnall Mór Ua Briain, King of Thomond (died 1194) or his son Murtogh, and married one of his daughters. This alliance probably took place during the reign of Murtough, as up to the time of his death Donal had been at war with the Normans. At any rate no more wars are recorded between the two sides for the rest of the decade. According to the Annals of Inisfallen, in 1201 William and the sons of Domnall Mór led a major joint military expedition into Desmond, slaying Amlaíb Ua Donnabáin among others.

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