Likely crowned co-emperor during his father's reign, he later served in the armies of Emperor Alexios I Komnenos.
[2] Anna Komnene notes that he and his brother Nikephoros both wore the diadem and tzangion (red sandals) usually reserved to emperors.
[4] Romanos IV Diogenes and Eudokia Makrembolitissa married on 1 January 1068, meaning they were born in late 1068 or early 1069 at the earliest, probably as twins.
Although elevated to the rank of co-emperor on their birth, they were both was banished to a monastery along with their mother after the fall of Romanos.
[7] In 1095 an impostor of Leo, Pseudo-Diogenes, convinced the Cuman chieftains Boniak and Tugorkan to invade the Byzantine Empire, dethrone Alexios, install himself as emperor.