Assertion: henry's heir | /r/HasProperty | edmund mortimer
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Source sentences:
text: Henry IV died in 1413, and the 26-year-old prince took the throne as Henry V. Conspiracies soon arose among his onetime friends to unseat him in favor of Richard II’s heir Edmund Mortimer.
text: Henry initially announced that his intention was to reclaim his rights as Duke of Lancaster, though he quickly gained enough power and support to have himself declared King Henry IV, imprison King Richard (who died in prison under mysterious circumstances) and bypass Richard's 7-year-old heir-presumptive, Edmund de Mortimer, 5th Earl of March.