What is "sebastos"

Sebastos ( "venerable one", pl. σεβαστοί sebastoi) was an honorific used by the ancient Greeks to render the Roman imperial title of Augustus. The female form of the title was sebastē (σεβαστή).

From the late 11th century on, during the Komnenian period, it and variants derived from it, like sebastokrator, formed the basis of a new system of court titles for the Byzantine Empire.