Family: William Fitz William / Agnes GREY (F14078)
The parent family of Sir, William III FITZWILLIAM, ,Knt,of Emley & Sprotbrough is the Birth Family.
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 | Richard GREY, ,Baron Grey of Codnor (1199-1271)
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 | Lucia de Humet (1204-1288)
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| Agnes Grey (1223- ) |
| Isabel de Grey (1229- )  |
| Sir John De Grey (1230-1272) |
| John Iv Grey (1235-1310) |
| William Fitz William (1208-1295) |
| Agnes GREY (1227- )
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| William FitzWilliam, V1 (1240-1294) |
| Edmund FitzWilliam (1293- ) |