protonotarios
High byzantine official. The chief of the notarioi (secretarial officials). The office of protonotarios was probably created with the system of the logothesia an was in use from the from the 9th to the 12th C. AD. In the Late Byzantine Period protonotarioi was the emperor's personal secretary and was mentioned as imperial grammateus.

protovestiarios
(and protovestiarites) Honorific title given to high-ranking officials and future emperors during this period. The protovestiarios was originally responsible for the imperial wardrobe, but in the 9th-11th centuries the holders of the title could command an army or conduct negotiations with foreign states.