Overview
Nikephoros Diogenes, Latinized as Nicephorus Diogenes, was presumably a junior Byzantine emperor around 1069–1071. He was born 1069 to Emperor Romanos IV Diogenes and Empress Eudokia Makrembolitissa. He was elevated to junior emperor in 1070, although he lost this position when his father was overthrown in 1071. Emperor Alexios I Komnenos, after overthrowing Nikephoros III, made Nikephoros doux of Crete, and made him a general. Nikephoros conspired against him in 1094, involving numerous confidants and relatives of Alexios, including Alexios' brother, Adrianos. For this conspiracy, he was blinded, in accordance with Byzantine traditions. After this, he retired to his estates, and spent the last years of his life studying classical literature.
History
Nikephoros was born 1069 to Romanos IV Diogenes and Eudokia Makrembolitissa, who married and were crowned on 1 January 1068. Nikephoros was presumably elevated to junior emperor shortly after alongside his brother (and possibly twin) Leo Diogenes. Although his half-brother Constantine Diogenes was the eldest son, he was borne of Romanos' first wife Anne, who was the daughter of Alusian of Bulgaria, and therefore was excluded from the succession when Romanos married Eudokia. Nikephoros and Leo were removed as co-emperor in 1071, after the deposition of their parents by Michael VII Doukas. Michael ruled until March 1078, when Nikephoros III Botaneiates overthrew him. Nikephoros III was himself overthrown by Alexios I Komnenos in 1081. Alexios is said to have treated the sons of Diogenes, including Nikephoros, "as if they were his own". Nikephoros was made doux of Crete by Alexios I Komnenos sometime in the early 1090s, likely either 1089–1091 or 1092–1094. He was also probably granted significant estates in Crete at the same time as his appointment.
In June 1094 Nikephoros began to conspire against Alexios, seeking to kill him and install himself as emperor. Because he was a porphyrogenitos, being born to Romanos while he was still reigning, he had more legitimacy than Alexios, who was only related by blood to the throne through his uncle Isaac I Komnenos. Nikephoros was also described as having many positive characteristics, such as natural charm, magnetic personality, and good looks.
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