Simplify the following text for a Grade 7 native English-speaking person.
Original: Henry was born in the tower above the gatehouse of Monmouth Castle and for that reason called Henry of Monmouth , son of Henry of Bolingbroke , later Henry IV , and sixteen-year-old Mary de Bohun .
Simplified: Henry V was the son of Henry Bolingbroke , later Henry IV , and Mary de Bohun , who died before Bolingbroke became king .