Margaret Heiress de MUMBY 
Margaret Heiress de was born about 1270 in Mumby, Spilsby, Lincolnshire, England. Margaret Heiress de's father was William de MUMBY. She was an only child. Margaret Heiress de is no longer alive.
They had a daughter named Agnes de.
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Children
Agnes de WILLOUGHBY
Agnes de was born in 1288 in Mumby, Lincolnshire, England. She died at the age of 92 in 1380 in Calthorpe, Lincolnshire, England.