The title could be applied in a generic sense to any senior official, such as the strategos of a theme, who was in a sense the deputy of the Byzantine Emperor. In a more technical sense, as used in the Taktika or lists of offices of the 9th–11th centuries, it was used by subordinate officials who deputized for a strategos or other provincial governor or one of the central government ministries for a specific district (called ekprosopike by Kekaumenos). The same usage is also attested in the ecclesiastical hierarchy.
- Bury, John Bagnell (1911). The Imperial Administrative System of the Ninth Century - With a Revised Text of the Kletorologion of Philotheos. London: Published for the British Academy by Henry Frowde, Oxford University Press. pp. 46–47.
- Kazhdan, Alexander P. (1991). "Ek prosopou". In Kazhdan, Alexander P.. Oxford Dictionary of Byzantium. New York and Oxford: Oxford University Press. p. 683. ISBN 978-0-19-504652-6.
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