Thomas de St. Omer Lord Brundale 
Thomas de St. Omer was born in of Brundale, Norfolk. Thomas de St. Omer's father was William de St. Omer and his mother was Petronilla de Lacy. His maternal grandparents were Walter de Lacy Lord Palatine of Meath and Margaret de Braose. He had a half-brother named Roger de Toeni V.
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