"Andronikos Doukas (Greek: Ἀνδρόνικος Δούκας), Latinized as Andronicus Ducas, was the third son of Byzantine emperor Constantine X Doukas (r. 1059–1067) and younger brother of Byzantine emperor Michael VII Doukas (r. 1071–1078). Unlike his other brothers, he was not named junior co-emperor by his father, and was raised to the dignity only by Romanos IV Diogenes (r. 1068–1071). He is otherwise relatively insignificant, and was not involved in the affairs of state to any degree." - (en.wikipedia.org 12.12.2019)
)