Ek prosopou

The title of ek prosopou (ἐκ προσώπου), meaning "representative", was widely used in the middle Byzantine Empire (9th–12th centuries) for deputies of various office holders.

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.