, Peter I, Duke Of Brittany Peter I, Duke of BrittanyI11704b: d: Ancestors ? ? ? Peter I, Duke of Brittany - ? ? ? Family Group Sheet - ChildPARENT (U) ?BirthDeath Father?Mother?PARENT (U) ?BirthDeath Father?Mother?CHILDRENMPeter I, Duke of BrittanyBirthDeath