Constantine X
Doukas or Ducas (. 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.
 
Already old and unhealthy when he came to power, Constantine died on 23 May 1067.[17] His final act was to demand that only his sons succeed him, forcing his wife Eudokia Makrembolitissa to take a vow not to remarry.[18] Both Michael and Konstantios were too young to rule, so Empress Eudokia ruled as the de facto ruler until 1 January 1068, when she married Romanos IV Diogenes and crowned him emperor.