Jan Šindel
He lectured on mathematics and astronomy and was also a personal astrologer and physician of kings Wenceslaus IV of Bohemia and his brother Holy Roman Emperor Sigismund . 
<triplet> Wenceslaus IV of Bohemia <subj> Sigismund <obj> sibling <triplet> Sigismund <subj> Wenceslaus IV of Bohemia <obj> sibling <subj> Holy Roman Emperor <obj> position held