Philip, Duke of Mecklenburg
He was the youngest son of Henry V , Duke of Mecklenburg , and Helen of the Palatinate , a daughter of Philip , Elector Palatine . 
<triplet> Henry V, Duke of Mecklenburg <subj> Helen of the Palatinate <obj> spouse <triplet> Helen of the Palatinate <subj> Philip, Elector Palatine <obj> father <triplet> Philip, Elector Palatine <subj> Helen of the Palatinate <obj> child