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Female Sibyl de Montagu Click to view Sibyl de Montagu in the family tree

Sibyl de was born about 1330 in Donyatt, Somerset, England.  Sibyl de's father was William IV de Montagu , KB, 1st Earl Salisbury and her mother was Katherine de Grandison.  Her paternal grandparents were William III 2nd Baron de Montagu , KB and Elizabeth de Montfort; her maternal grandparents were William 1st Baron de Grandison , Sir and Sibyl de Tregoz. She had two brothers and two sisters, named William de, John 1st Baron de, Elizabeth de and Phillipa de.  She was the third oldest of the five children.

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