Assertion: henry's heir | /r/HasProperty | 5th earl of march
Facets:
Source sentences:
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.