Eustace de Burgo , Baron of Tonsburgh 
Eustace de was born about 1005 in Tonsburgh, Normandy, France. Eustace de's father was Jean de Conteville , Vicomte de Comyn. He had a brother and a sister, named Harlevin (Herlouin) Vicomte de and Oda de. He was the youngest of the three children. Eustace de is no longer alive.General Notes
Eustace de Burgh, Baron Tonsburgh, in Normandy, younger brother of Harlowen de Burgh, the ancestor of the Lords Clanricarde, and the numerous families of De Burgh, Burke, and Bourke, had two sons, Serlo, and John, surnamed Monoculus, from having but one eye. [Sir Bernard Burke, Dormant and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 121, Clavering, Barons Clavering]
Note: Apparently John "Monoculus" de Burgo was not a son of Eustace, despite the similar name.
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