consularis
A Roman title that was given to former consuls. From the 3rd century on, the title was also used for governors of provinces where several legions were assigned.

kommerkion
This name had two meanings in Byzantium 1. Commercium (lat.), which in late Roman times designated the frontier cities where exchanges with foreign merchants were authorised. 2. Kommerkion, which was a circulation and sales tax, paid at the customs, and collected on mercandise imported into the empire and on merchandise reaching Constantinople by the sea. It appears in the sources c. 800 and was also called dekate, its rate being 10 percent of the merchandise value.

praetorian prefecture (praefecura praitorio)
In Late Roman Empire it was the basic administrative unit. Prefectures were estabished by Constantine I (4th century). The Empire was then divided to four praetorian prefectures: i) praefectura praetorio per Orientem (prefecture of Oriens), ii) praefectura praetorio Galliarum (prefecture of Galliae), iii) praefectura praetorio per Illyricum (prefecture of Illyricum), iv) praefectura praetorio Italiae, Illyrici et Africae (prefecture of Italia and Africa).

taktikon
1. Adm.: A major source for the organization and development of Byzantine administration. In the Middle Byzantine period the taktika, as presedance lists ( τακτικά πρωτοκαθεδρίας or τακτικά της καθέδρας or κλητορολόγια or κλητοροθέσια) catalogued the officials who participated to the formal ceremonies of the imperial palace. Four precedence list are still preserved: Uspenskij, Philotheos', Benescevic, de l' Escurial. 2. Mil.: A "Taktika" is a famous manual for strategic and tactical military operations by land and by sea. Author in the early 10th century. at Leo F. The text preserved in a compendium and complete the form and influenced the drafting of such handbooks as downstream strategic. 3. Eccl.: The “taktiko”, known also as “Notitia episcopatuum” or syntagmation , in the administration of the Church is a classification list of ecclesiastical authorities according to hierarchy.

vicarius
Τhe term refers to the substitute of various officials. Since the 3rd century, the vicarius replaced mostly procuratores from the equestrian class. The most important vicarii were those who replaced the Praetorian eparchs in the dioceses set up by Diocletian. In addition, the vicarii could have military (like the command of the garrison in Egypt) or even judicial responsibilities.