King Roger I of England

At one time King Richard II of England's heir was Roger Mortimer, 4th Earl of March.
Roger was the grandson of Lionel of Antwerp, Edward III's second son.
In 1389 Roger served the Crown as Lord Lieutenant of Ireland.
In June of 1389 he was killed at Kenlis in Leinster.

In September of 1399 King Richard II abdicates.
Suppose Roger Mortimer had lived. He becomes King Roger I.
How would his reign change events?
 
In September of 1399 King Richard II abdicates.
Suppose Roger Mortimer had lived. He becomes King Roger I.
How would his reign change events?

Richard didn't abdicate out of the blue sky; he was forced to abdicate by his cousin Henry Bolingbroke, Duke of Lancaster - so that Henry could take the throne as Henry IV.

If Roger Mortimer is alive, he is heir presumptive. OTL his son was HP, but Edmund was a boy of 9, and easily thrust aside. That makes life very complicated for Bolingbroke. Mortimer won't accept the deposition, nor Bolingbroke's usurpation. Henry might have Mortimer arrested and executed.

OTL - Edmund Mortimer's claim was asserted in the 1403 rebellion by his uncle, though he was only a boy. It was asserted again in the Southampton plot of 1415 by his sister's husband - but Mortimer himself revealed the plot to Henry, and joined in the condemnation of the plotters to execution.

He was a loyal and important vassal of Henry V and Henry VI till his death in 1425. And no one seems to have worried about his sister's marriage and child at the time, though that was how the Yorks inherited the claim they later asserted in the Wars of the Roses.

Roger may have been of different stuff. As noted, he's likely to raise a fight against Bolingbroke. If so, Henry IV may take definite steps to extinguish the Mortimer claim; keeping the children locked up indefinitely.
 
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