According to Alison Weir, Henry VII was a little twitchy about his descent from John of Gaunt’s notorious mistress (and eventual wife) Katherine de Roët/Swynford. Between them, Gaunt and Katherine produced an illegitimate line of children, the Beauforts, which wasn’t/was/wasn’t legitimate/in line of succession, according to different monarchs. Henry VII was a Beaufort, so you can imagine which side of the argument he was on! Katherine might also have still been married to her first husband, Sir Hugh Swynford, when she conceived the first Beaufort, which was something else to make Henry VII shift uncomfortably. I am only surprised that Henry did not attempt to claim Katherine was descended from King Arthur. Henry was very keen indeed to prove that he and his line were rightful Kings of England because they had Arthur’s blood in their veins.
Anyway, I quote (from Weir’s biography of Katherine):-
“. . .The epitaph on John of Gaunt’s tomb in Old St Paul’s Cathedral, which was lost in the Great Fire of 1666, described Katherine as eximia pulchritudine feminam – ‘extraordinarily beautiful and feminine’. This epitaph was not contemporary but was placed on the restored sepulchre in the reign of Henry VII, who was desirous of restoring the good reputation of this rather dubious ancestress. It is unusual to find words of this kind in an epitaph – the emphasis is usually on virtue and good works – but since Henry VII could hardly laud Katherine’s virtue, it is possible that he ordered reference to be made to her beauty because it was one of the things people did remember her for, and it may even have been referred to in the original tomb inscription, which had been destroyed in living memory. . .”
So, Henry Tudor was up to more of his usual meddling tricks? Making sure posterity was recorded as he wanted it recorded? What a surprise. BUT, in one thing Katherine herself signally failed. Her extraordinary beauty did not descend to Henry or his Beaufort mother!
Sources for the above illustration: The lost tomb of John of Gaunt and his wife Blanche, old St.Paul’s Cathedral, London. From The History of St Paul’s Cathedral in London by William Dugdale, 1658. Originally from Wenceslaus Hollar Digital Collection at University of Toronto. Likeness of Henry VII from civ6customization.gamepedia.com