Nikephoros I

Nikephoros I (Greek: Νικηφόρος, romanized: Nikēphóros; 750 – 26 July 811), also known as Nicephorus I, was Byzantine emperor from 802 to 811. He was General Logothete (finance minister) under Empress Irene, but later overthrew her to seize the throne for himself. Prior to becoming emperor, he was sometimes referred to as "the Logothete" (Greek: ὁ Λογοθέτης, romanized: ō Logothētés) and "Genikos" or "Genicus" (Greek: ὁ Γενικός, romanized: ō Gēnikós), in recognition of his previous role as General Logothete.

During his reign, Nikephoros engaged in military campaigns against both the Arabs and the Bulgarians, although the outcomes were varied. While leading an invasion into Bulgaria, he suffered a defeat and was killed at the Battle of Pliska.

Source: Wikipedia — https://en.wikipedia.org/wiki/Nikephoros_I