(λογαριαστής||accountant) was a type of financial official in the Byzantine Empire from the early 11th century onwards, with the task of controlling expenses.
The post is attested for the first time in 1012, and existed both within the financial bureaux of the central government such as those of the, the and the as well as in the provincial administration, in monasteries or in private estates. appear in the sources until the 15th century.
Emperor Alexios I Komnenos created the post of (Greek, Ancient (to 1453);: μέγας λογαριαστής, 'grand accountant'), first attested in 1094. Initially, it shared the duty of general comptroller of the fisc with the, but soon replaced the latter office entirely. The post is attested until the 14th century. In the mid-14th century Book of Offices of pseudo-Kodinos, the is ranked 40th in the palace hierarchy, following the and preceding the . According to peudo-Kodinos, by his time he had no function, but was merely an honorific dignity. The costume of office was identical to that of the, i.e. a turban and the, probably a descendant of the middle Byzantine, a garment worn over armour.
In the 14th century, the special post of the (Greek, Ancient (to 1453);: λογαριαστὴς τῆς αὐλῆς, 'accountant of the court') is attested, responsible for paying the salaries of certain courtiers. A (Greek, Ancient (to 1453);: λογαριαστὴς τῶν χρυσοβοῦλλων, 'accountant of the chrysobulls') is also recorded, but its duties are unclear.