, Roger De Mortimer, 4Th Earl Of March Roger de Mortimer, 4th Earl of MarchI10793b: d: Ancestors ? ? ? Roger de Mortimer, 4th Earl of March - ? ? ? Family Group Sheet - ChildPARENT (U) ?BirthDeath Father?Mother?PARENT (U) ?BirthDeath Father?Mother?CHILDRENMRoger de Mortimer, 4th Earl of MarchBirthDeath