AH Challenge: John of Gaunt becomes John II

What POD do you need and what are the effects of John of Gaunt becoming king?
Would he rule as John II or was John I such a failure that he would rule under another name?
 
There are two people whom you would need to eradicate from history in order for John of Gaunt to follow his father to the throne. They are Richard of Bordeaux (OTL King Richard II) and Philippa, the daughter of Lionel of Antwerp.

If Lionel died in battle in either France or Ireland prior to her birth, then the latter is eliminated rather easily. Considering that the other son of the Black Prince died in childhood, it is not unthinkable in this era for the same to occur to Richard either. (The same applies to Philippa.)

That would lead to the rise of King John II in 1377. He was married to the claimant to the Castilian throne, so I imagine that an England under his rule would have had a primary focus of trying to unite England with Castile and remove the illegitimate Henry the Sufferer. Other than that, history would not have been significantly different for the first ten years at least as he was already Regent in OTL.
 
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