His parentage is confirmed by Nikeforos Bryennios who names him "Constantino Diogenis iam imperatoris filio" when recording his marriage. Nikeforos Bryennios records that "sororis eius Constantinus imperatoris Diogenis filius" was killed in battle in Antioch. 1
Marriage Information:
Konstantinos married Theodora KOMNENE, daughter of Ioannes KOMNENOS, domestikos, patrikios, and Anna DALASSENE of Italy, between 1068 and 1071. (Theodora KOMNENE was born between 1050 and 1057 and died after 1094.)