| Constantine X Doukas | |
|---|---|
| Emperor and Autocrat of the Romans | |
 | |
| Byzantine emperor | |
| Reign | 23 November 1059 – 23 May 1067 |
| Predecessor | Isaac I |
| Successor | Romanos IV Eudokia (regent) |
| Co-emperors | Konstantios Michael VII |
| Born | c. 1006 |
| Died | 23 May 1067 (aged 60–61) |
| Spouse | Delassena Eudokia Makrembolitissa |
| Issue | by Eudocia Michael VII Doukas A son Anne Doukaina Andronikos Doukas Theodora Doukaina Konstantios Doukas Zoe Doukaina |
| Dynasty | Doukas |
| Father | Andronikos Doukas |
Constantine X Doukas or Ducas (Greek: Κωνσταντῖνος Δούκας, Kōnstantinos Doukas, 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.
- ^ Spatharakis 1976, pp. 27–34.