William de Burgh De MORTAIN 
William de Burgh was born about 1158 in Viceroy?, IRELAND?. William de Burgh's mother was (Princess) Agnes De FRANCE. His maternal grandparents were (King) Louis VII De FRANCE and (Queen) Alice (Adela) De CHAMPAGNE. He was an only child. William de Burgh is no longer alive.
Details of William de Burgh's family with (Princess) Isabel PLANTAGENET
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