IOANNES "Kaloioannes" Angelos (-before 13 Jan 1254). Pope Honorius III wrote to "nobili viro Johanni nato…Margarite quondam imperatricis Constantinopolitane" requesting him to keep his promise to campaign against the Bosnian heretics, dated 15 Jan 1227[837]. Hungarian under-Lord in Syrmia 1235/42. Obergespan of Kö 1235. "Iohannes filius quondam Iursac Imperatoris Constantinopolitani" gave commitments to the papal legate in Hungary by charter dated 22 Sep 1235[838]. Obergespan of Bács 1240/42. m MATHILDE von Vianden, daughter of HEINRICH [I] Graf von Vianden & his wife Marguerite de Courtenay. Her parentage and marriage are confirmed by the dispensation issued by Pope Innocent IV for the marriage of "Anselmum de Keu ac Mariam natam Matildis dominæ de Posaga, natæ comitissæ Viennensis" dated 15 Aug 1253, and the marriage licence for "Maria, nate quondam Calojohanni" dated 13 Jan 1254, the documents naming "imperatore Constantinopolitano, eiusdem Matildis avunculo"[839]. Ioannes & his wife had [two] children