| Notes |
- John's first child was an illegitimate daughter, Blanche (1359-1388/89). Blanche was the daughter of John's mistress Marie de St. Hilaire of Hainaut (1340-after 1399), who was a lady in waiting to his mother, Queen Philippa. The affair apparently took place before John's first marriage, which was to his cousin Blanche of Lancaster.John's daughter, Blanche, married Sir Thomas Morieux in 1381. Morieux held several important posts, including Constable of the Tower the year he was married, and Master of Horse to King Richard II two years later. He died in 1387 after six years of marriage.
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1359 - 1389 (30 years)
, d. 3 Feb 1398/9, Leicester Castle, Leicester, Leicestershire, England 