Constantine Diogenes

[1] In 1014, he participated in the decisive Byzantine victory at the Battle of Kleidion (July 29),[2] and he subsequently succeeded Theophylact Botaneiates as commander (doux) of Thessalonica with the rank of patrikios, making him the second-most senior general of the Empire in the Balkans after David Arianites.

[3][4] Following the death of Tsar Samuel of Bulgaria in October, Diogenes and Nikephoros Xiphias were dispatched to the region of Moglena as the vanguard of the emperor and the main army.

[5] Soon after, Basil II placed Diogenes in charge of the tagmata of the Scholai of the West and of Thessalonica, and tasked him with pursuing Tsar Ivan Vladislav.

[3][6] Diogenes was ordered by Basil II to subdue Sermon, the ruler of Sirmium, to consolidate Byzantine control of the northern Balkans.

[1][5][12] Theodora herself was placed in a convent, but she apparently continued to conspire with Diogenes, who planned to take advantage of Romanos's absence on campaign in the East in 1032 to escape to the Balkans.

Diogenes was brought to the Palace of Blachernae for interrogation by John the Orphanotrophos, but he died by suicide, throwing himself off a wall, rather than confess under torture and implicate his fellow conspirators.