Sergios Niketiates is an obscure and "enigmatic" figure, known only through brief references in two hagiographic works, the Acts of Saints David, Symeon and George and the Synaxarium Constantinopolitanum. According to these, Sergios was born in the village of Niketia, near Amastris in Paphlagonia, whence his surname. He was a close relative, possibly the uncle, of Empress Theodora, the wife of Emperor Theophilos and mother ofMichael III. Under Theophilos, he became one of the leading members of the Byzantine Senate, reaching the supreme court rank of magistros. Seals attributed to him also record him having progressively advanced through the levels of hypatos, anthypatos, protospatharios and patrikios, and having held the office of General Logothete or Logothete of the Drome. In 843, Sergios was instrumental, along with the logothete Theoktistos and Theodora's brothers, Bardas and Petronas, in bringing about the final abandonment of Iconoclasm and the restoration of the veneration of icons, an act for which he is celebrated as a saint by the Orthodox Church on 28 June. In the same year, according to the Synaxarium Constantinopolitanum, he was entrusted with leading an expedition against the Emirate of Crete, but all other sources record that Theoktistos led the campaign. It is possible, however, that Sergios was left behind when Theoktistos was forced to hurriedly return to Constantinople. Sergios died on Crete, where the Byzantine forces were defeated by the Arabs, and was initially buried on the island in a monastery that became known after him as tou Magistrou. He was later moved to a Monastery of the Theotokos in the Gulf of Nicomedia, which he had founded and which in turn became known as tou Niketiatou thereafter. The French Byzantinist Henri Grégoire suggested that Niketiates is to be identified with "Ibn Qatuna", the admiral recorded in Arabic sources as having led the Byzantines in their sack of Damietta in 853, but although this hypothesis was taken up by some, it is rejected by modern scholars. Grégoire also hypothesized that Sergios was the brother of the later Patriarch Photios, a conjecture also rejected, although according to Cyril Mango he could possibly be Photios's maternal uncle.
