Paul Luther
He was the third son of the German Protestant Reformer Martin Luther and was successively physician to John Frederick II , Duke of Saxony; Joachim II Hector , Elector of Brandenburg; Augustus , Elector of Saxony and his successor Christian I , Elector of Saxony . 
<triplet> Martin Luther <subj> Protestant Reformer <obj> occupation <triplet> Augustus, Elector of Saxony <subj> Christian I, Elector of Saxony <obj> child <triplet> Christian I, Elector of Saxony <subj> Augustus, Elector of Saxony <obj> father