Lets say Lionel of Antwerp, 1st Duke of Clarence had a posthumous son named Guglielmo di Clarence in 1369 by his second wife Violante Visconti. So what happens next? Please discuss!!!
I think Richard (II) would see Clarence (William) as a rival, like he did with everyone else in his family. Clarence would remain loyal until Richard has an heir. (Like Richard Plantagenet, 3rd Duke of York did.) Does anyone know who Clarence would marry?
I can see Clarence marrying a more distant cousin, maybe one of the de Bohun heiresses, or a Beauchamp, Neville, Mortimer, Hastings, Holland.
Was Lionel made Earl of Ulster in his own right, or just jure uxoris?
Clarence could marry Eleanor de Bohun. (c. 1366) She was the co-heiress of her father Humphrey de Bohun, 7th Earl of Hertford.
Well here's a more interesting question: What would happen with the War of the Roses? I assume having a male her presumptive instead of a female wouldn't make Richard II treat the future Henry IV any better, so would having a more direct heir make Henry less successful with over throwing Richard? Also with the war of the roses, the House of York's claim was through the female line, while the new House of Clarence's would be through the male line, so maybe an earlier war?
The heir presumptive OTL was Lionel's grandson (or great grandson) - http://en.wikipedia.org/wiki/Roger_Mortimer,_4th_Earl_of_March or http://en.wikipedia.org/wiki/Edmund_Mortimer,_5th_Earl_of_March
Either way, Henry got his way by being in place to force the issue - here, he's not, unless Clarence waives his claim or is dead.
And with a POD this far back, Henry VI* is likely to be different - which makes a big impact on the whole mess.
So we could see the Plantagenet last much longer than OTL. I wonder what a house of Clarence would mean for the hundred years war?