Constantine Dalassenos (duke of Antioch)

Constantine Dalassenos was a prominent Byzantine aristocrat and military leader of the 11th century. He belonged to the powerful Dalassenos family, which produced several high-ranking officials and generals during the reigns of emperors Basil II and Romanos III.

Constantine Dalassenos served as doux (duke) of Antioch, a strategically important command that controlled a large portion of the Byzantine Empire's eastern frontier bordering with the Muslim world. While the exact dates of his tenure are subject to scholarly debate, it is generally believed he held the position during the reigns of Romanos III Argyros and possibly Michael IV.

His period as doux of Antioch was marked by conflict with the Fatimid Caliphate. He actively participated in military campaigns against them, aiming to secure and expand Byzantine territories in Syria. Notably, he clashed with the Fatimid governor of Aleppo, Shibl al-Dawla Nasr, leading and commanding Byzantine forces in various battles and raids.

Dalassenos's military career was not without its setbacks. He was involved in a significant defeat at the Battle of Azaz in 1030, during Romanos III's campaign against Aleppo. Despite this loss, he continued to serve the empire.

While specific details of his life beyond his military activities are scarce, Constantine Dalassenos is recognized as a significant figure in Byzantine military history for his role in defending and projecting Byzantine power in the East during a turbulent period. His command in Antioch was pivotal to the empire's security. He eventually became a monk later in his life.