Overview
Isaac Komnenos or Comnenus (, Isaakios Komnēnos; – 1102/1104) was a notable Byzantine aristocrat and military commander in the 1070s. Isaac played a major role in the rise to the throne of his younger brother, the Byzantine Emperor Alexios I Komnenos, and remained a leading figure in his brother's administration until his death.
Isaac was born to the highest aristocracy of mid-11th century Byzantium, a position reinforced through marriage ties to the imperial Doukas dynasty. Well educated and brave, in 1073–1078 Isaac occupied two of the highest military positions in the Byzantine Empire, as Domestic of the Schools and doux of Antioch. His military record against the Seljuk Turks was not particularly distinguished, but on his return to Constantinople in 1078 he gained the favour of Emperor Nikephoros III Botaneiates, and of Empress Maria of Alania. Isaac and Alexios used imperial favour to further their own designs on the throne, launching a revolt in early 1081 that saw Alexios crowned emperor. As a reward, Alexios created the title of sebastokrator for Isaac, which put him almost on par with the emperor. During Alexios' reign and until his death, Isaac played an important role in domestic affairs in matters of public order and justice, being called to examine several cases of conspiracy or heretical teachings.
Early life and career
Isaac was the second-eldest son and third child of the domestikos ton scholon John Komnenos, and his wife Anna Dalassene. The exact date of his birth is unknown, but was likely around 1050. According to his niece, the historian-princess Anna Komnene (Alexiad, 77–78), he was physically similar to his younger brother, the future emperor Alexios, though he was paler and his beard was less bushy. According to Anna, he enjoyed hunting and war, where he would put himself in the vanguard during battle. Anna and other contemporaries, like Theophylact of Ohrid, underline Isaac's virtue and his capability of befriending people, although Anna also mentions that he was often short-tempered, and that he could suddenly explode on account of a single word. According to all sources, Isaac was extremely well educated; the Patriarch of Antioch, John the Oxite, records that he was competent in the interpretation of scripture, while Basil of Euchaita credits him with an extensive knowledge of philosophical matters.
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