Sibyl Marshal 
Sibyl was born about 1191 in Pembroke, Pembrokeshire, Wales. Sibyl's father was William Marshal , 3rd Earl of Pembroke and her mother was Isabel de Clare , Countess of Pembroke. She had a brother and four sisters, named William, Maud, Eva, Isabel and Joan. She was the second oldest of the six children. She died before 1238.
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