Robert Willoughby 
He had a biological son named Sir Thomas.
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Personal Details
Robert Willoughby
Robert was born in 1348 in Eresby Manor, Lincolnshire, England.1 He died at the age of 48 on August 9th, 1396 in Eresby Manor, Lincolnshire, England.1
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Children
Sir Thomas Willoughby
Sir Thomas was born in 1380 in Eresby Manor, Lincolnshire, England. Sir Thomas is no longer alive.