Constantine X Doukas

Constantine X Doukas or Ducas (Greek: Κωνσταντῖνος Δούκας, romanized: Kōnstantīnos Doúkās; c. 1006 – 23 May 1067), was Byzantine emperor from 1059 to 1067. He was the founder of the Doukid dynasty. During his reign, the Normans took over much of the remaining Byzantine territories in Italy, while in the Balkans the Hungarians occupied Belgrade. He also suffered defeats by the Seljuk sultan Alp Arslan.

Source: Wikipedia — https://en.wikipedia.org/wiki/Constantine_X_Doukas