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Male Duarte of Portugal I Click to view Duarte of Portugal I in the family tree

Duarte was born on October 31st, 1391 in Viseu.1   Duarte's father was John of Portugal I and his mother was Philippa of Clarence.  His maternal grandparents were Lionel Plantagenet of Antwerp and Elizabeth de Burgh. He had two brothers and a sister, named Henry, John and Isabella.  He was the oldest of the four children. He had two half-brothers and two half-sisters, named Roger, Edmund, Elizabeth and Philippa.

1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=jdp-fam&id=I12976

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