He was reputed to be a very handsome man. Queen Catherine couldn’t keep her hands off of him.
The “hole” monarchy/ruling lineage is full of incest throughout europe.
He also was father to Margret Tudor, who married James IV, King of Scots, and gave birth to the child who became James V, King of Scots.
She also was great-grandmother to James VI, King of Scots, who also became James I, King of England and Ireland when Henry VIII's daughter, Queen Elizabeth I, died without issue.
So Owen was progenitor to two different dynasties on the English throne plus one on the Scottish throne.
And every one was an Henry (Henry)
She wouldn’t have a Willy or a Sam (no Sam)
I’m her eighth old man, I’m Henry
Henry the eighth I am