The epi tes katastaseos () was a court office of the Byzantine Empire, attested in the 9th–10th centuries.
The origin and exact nature of the office are unclear. J. B. Bury translated the title as "master of ceremonies" since may be interpreted as "order", and derived its origin from the late Roman , the head of the , a department under the authority of the . George Ostrogorsky and Ernst Stein on the other hand pointed out that the ceases to be mentioned after 534, and suggested that the was a descendant of the , attested from the time of Justinian I (reigned 527–565) on.
The mid-9th century Taktikon Uspensky is ambiguous as to its role, placing the office first among the civil officials (between the and the ) and then among the lower-ranking courtiers. The of 899 records the office as one of the "special dignities" (), and records that his staff comprised the orders () of , , , the , and the ("senators", which Bury suggests might be emended to ), although most of them were ranks of dignitaries rather than court functionaries. The De Ceremoniis, compiled in the later 10th century, on the other hand, places the office firmly among the court officials, usually in conjunction with the .
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