cross-in-square church
Type of church in which four barrel-vaulted bays form a greek cross; the central square of their intersection is domed. The cross is inscribed into the square ground plan by means of four corner bays.

dome
A characteristic element of Byzantine architecture. The dome is a hemispherical vault on a circular wall (drum) usually pierced by windows. The domed church emerges in the Early Byzantine years and its various types gradually prevail, while they are expanded in the Balkans and in Russia.

praetor
Political and juridical magistrate of the Roman Republic and the late Roman Empire. The title was originally borne by two magistrates who were chosen annually to serve as eponymous heads of the state, but the number of praetors increased within the years. The title was retained with intervals in the Early Byzantine Period. The office appeared again in the mid-9th cent. and denoted the governor of an administration unit of the empire. Hierarchically, the praetor was inferior to the strategos of the theme.

vilayet (valilik)
The larger administrative unit in the Ottoman provincial administration system. The large provinces of the Ottoman Empire were previously called eyalet. The new regulation of 1864 introduced the vilayet as an equivalent of the French départment - albeit of smaller size. The governor of the vilayet was called vali and had extensive authority.