Nicetas I of Constantinople (or Niketas; Greek: Νικήτας; died 6 February 780) was the Ecumenical Patriarch of ConstantinopleWalter de Gruyter (2008), Biographical Index of the Middle Ages, p. 804. from 766 to 780. He was of Slavic ancestry and he was a eunuch.George Crabb (1833), Universal Historical Dictionary - Or, Explanation of the Names of Persons and Places in the Departments of Biblical, Political, and Ecclesiastical History, Mythology, Heraldry, Biography, Bibliography, Geography, and Numismatics.
He was chosen by the Emperor Constantine V as a successor of the Patriarch Constantine II of Constantinople. However, Nicetas I was quite unpopular in Constantinople because he was a supporter of iconoclasm. After his death in 780, Nicetas I was declared a heretic. He was succeeded by Paul IV of Constantinople.
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