Born in 1050 as the eldest son of Constantine X. Co-emperor since 1059, he succeeded on his father's death. Due to his minority he was under the regency of his mother, Eudokia Makrembolitissa, in 1067–1068, and relegated to junior emperor under her second husband Romanos IV Diogenes in 1068–1071. Senior emperor in 1071–1078, he named his son Constantine co-emperor alongside his brothers. He abdicated before the revolt of Nikephoros Botaneiates, retired to a monastery and died c. 1090.