|Offspring of Morgan and Katherine Cromwell (c1468-)|
|Richard Williams Cromwell (c1495-c1550)||1495||1550|| Frances Murfyn (c1498-1533)|
|Offspring of Sir Richard Cromwell and Frances Murfyn (c1498-1533)|
|Francis Cromwell (c1532)|| |
|Henry Cromwell M.P. (c1533-1603)||1537||1603|| Joan Warren (c1540-1584)|
Susan Weeks (c1550-1593)
Although Catherine married, her children kept her name, possibly to maintain their connection with their famous uncle. The family line continued through Richard Cromwell (c. 1500-1544), Henry Cromwell (c. 1524-6 January 1603), then to Oliver's father Robert Cromwell, Esquire (c. 1560–1617), who married Elizabeth Steward or Stewart (1564–1654) on 25 April 1599, the day she delivered him a son.
Another interesting feature of the Cromwell bloodline is that the mother's maiden name, unlike the argument above, might have been kept as the surname for a different purpose: to disguise the male side of the family's heritage instead of merely accentuating the female's side from Thomas Cromwell. This heritage goes through the Tudors, de Valois, and Wittelsbach—three royal dynasties of England, France, and the Holy Roman Empire, respectively.
His alleged paternal ancestor Jasper Tudor was a younger brother of Edmund Tudor, 1st Earl of Richmond and uncle to his son Henry VII of England. Jasper was arguably the architect of the Tudor victory in the Battle of Bosworth Field against Richard III of England on 22August 1485. The outcome of that battle led to the successful conquest of England and Wales by his nephew, which established the hegemony of the Tudor dynasty at the close of the Wars of the Roses.
Both Edmund and Jasper Tudor were sons of Owen Tudor and Catherine of Valois, daughter of Charles VI of France and Isabeau of Bavaria. Catherine was also widow of Henry V of England. Her mother Isabeau was the daughter of Stephan III, Duke of Bavaria-Ingolstadt and Thadea Visconti.