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Male William de Roos III Baron Roos Click to view William de Roos III Baron Roos in the family tree

William de Roos III was born in Yorkshire, England.1   William de Roos III's father was Robert de Roos IV Baron Roos and his mother was Isabel de Albini.  His paternal grandparents were William de Roos and Lucia FitzPiers; his maternal grandparents were William de Albini Lord Belvoir and Albreda Biseth.  He was an only child.  He died on August 15th, 1316.1 

Family Details of William de Roos III's family with Maud de Vaux

1 large-G675.FTW
Further sources/citations:
Garner, Lorraine Ann "Lori", Garner, Lorraine Ann "Lori"

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