Constantine Doukas Emperor and Autocrat of the Romans Engraving of Constantine Doukas from the Holy Crown of Hungary Co-emperor of the Byzantine Empire Reign 1074–1078 Predecessor Michael VII Successor Nikephoros III Botaneiates Co-emperors Romanos IV Diogenes (1068–1071) Nikephoros Diogenes (1070–1071) Michael VII Doukas (1071–1078) Konstantios Doukas (1071–1078) Andronikos Doukas (1068–1070s) Reign 1081–1087 Predecessor Nikephoros III Botaneiates Successor Alexios I Komnenos Born Late 1074 Died c. 1095 Dynasty Doukid dynasty Father Michael VII Mother Maria of Alania