Answer
Isaac Komnenos was the father of Andronikos I Komnenos. Isaac was a Byzantine emperor from 1057 to 1059. He was the son of Constantine X Doukas and Zoe Porphyrogenita, and the brother of Constantine XI Doukas. Isaac was a military commander and he was responsible for defeating the Seljuk Turks at the Battle of Manzikert in 1071.