Nielsen Hayden genealogy
Family: John de Mowbray / Joan of Lancaster (F5981)
m. Between 28 Feb 1327 and 4 Jun 1328
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Male
John de Mowbray
Birth 29 Nov 1310 Hovingham, Yorkshire, England 
Death 4 Oct 1361 York, Yorkshire, England 
Burial Friars Minor, Bedford, Bedfordshire, England 
Marriage Between 28 Feb 1327 and 4 Jun 1328 [1] Other Spouse Maud de Holand | F17336 Marriage Bef 26 Feb 1322 Father John de Mowbray | F4694 Group Sheet Mother Aline de Brewes | F4694 Group Sheet
Female
Joan of Lancaster
Birth Abt 1312 Death Abt 1349 Burial Byland, Yorkshire, England 
Father Henry of Lancaster | F1680 Group Sheet Mother Maud de Chaworth | F1680 Group Sheet
Female
+ Eleanor de Mowbray
Birth Death Bef 10 Jun 1387 Burial Spouse Roger la Warre | F19231 Marriage Bef 23 Jul 1358
Male
+ John Mowbray
Birth 25 Jun 1340 Epworth, Lincolnshire, England 
Death 17 Jun 1368 Thrace, near Constantinople 
Burial Church and Convent of St. Mary Draperis of Pera, Constantinople 
Spouse Elizabeth de Segrave | F4245 Marriage Aft 25 Mar 1349
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Sources - [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.
- [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.