Constantine X Doukas was the ruler of the Byzantine Empire from 1059 to 1067 CE. During his reign, the Byzantine Empire was attacked by emerging enemies on all sides, including the Normans in Italy and the Seljuk Turks in Armenia and Anatolia. Constantine's policies isolated the Monophysite Armenians, downsized the army at the worst possible moment, and contributed to the general decline of Byzantium during the second half of the 11th century CE. Although Constantine was a poor emperor, it was his successors who would have to bear his unhelpful legacy.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Constantine_X_Doukas/.