doukas (lat. dux)
Antiquity: Roman military commander who, in some provinces, combined military and civil functions.Buzantium: a higher military officer. From the second half of the 10th c. the title indicates the military comander of a larger district. After the 12th c., doukes were called the governors of small themes.

patrikios
(from lat. patricius) Higher title of honour, placed, according to the "Tactika" of the 9th and the 10th centuries, between anthypatos and protospatharios. It was given to the most important governors and generals. Gradually, however, it fell into disuse and from the 12th century did not exist any more.

protosebastos
Ηigh-ranking title usually bestowed upon close relatives of the emperor. The title was introduced by Alexios I Komnenos. In the 12th century it was awarded to close associates of the emperor and to members of aristocratic families, such as the Palaiologos, Tarchaneiotes, Raoul and Metochites families.

sebastos
("venerable") Title of honour created by Constantine IX the Monomachos in the middle of the 11th century. Originated from the translation of the imperial adjective augustus. This title was given successively to the two mistresses of the emperor.

strategos ("general")
During the Roman period his duties were mainly political. Οffice of the Byzantine state´s provincial administration. At first the title was given to the military and political administrator of the themes, namely of the big geographic and administrative unities of the Byzantine empire. Gradually the title lost its power and, already in the 11th century, strategoi were turned to simple commanders of military units, responsible for the defence of a region.