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Male 1st Earl of Salisbury, 3rd Lord Montagu William de Montagu (William Montacute) Click to view 1st Earl of Salisbury, 3rd Lord Montagu William de Montagu in the family tree

William was born in 1301 in Cassington, Oxfordshire, England.1   William's father was Baron Montague William de Montague and his mother was Elizabeth de Montfort.  His paternal grandparents were Simon de Montague and Hawise de St. Armand; his maternal grandparents were Peter de Montfort II and Mathilda de la Marr. He had two brothers and seven sisters, named Edward, Simon, Elizabeth, Maud, Alice, Mary, Katherine, Hawise and Isabel.  He was the oldest of the ten children.  He died at the age of 42 on January 30th, 1343 in Windsor Castle, Berkshire, England.1 

Family Details of William's family with Catherine de Grandison

1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I5066&style=TABLE
Further sources/citations:
http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I5066&style=TABLE, http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=arciek&id=I18559

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