The exact date of their institution is unknown. They are first mentioned in 319, but may date to
Diocletian's reforms in the late 3rd century, when they replaced the earlier and much-detested
frumentarii. The central imperial administration still needed couriers, and the
agentes in rebus filled this role. Originally they acted as dispatch carriers, but eventually assumed a variety of duties—the title itself translates as "Those Active in Matters". They fell under the jurisdiction of the
magister officiorum (Master of the Offices), hence their alternate Greek name of
magistrianoi.
Ostrogothic Kingdom The schola of the
agentes in rebus of the
Western Empire did not cease to exist when the West fell, but the office underwent a transformation over the following decades. By the time of the
Ostrogothic Kingdom, the function of the
agentes was now inherited by two new types of officials,
comitiaci, who were Romans and
saiones, who were Goths. These agents answered directly to the King and existed outside of the traditional power structure within the realm. Evidence suggests responsibilities differed between the two types of agents, though they likely frequently collaborated with one another due to overlapping interests of the two groups of citizens.
Comitiaci are known to have been responsible for affairs concerning Romans, such as hauling people to court who did not appear and dealing with corrupt Roman officials, though
comitiaci do not appear to have had any military authority nor were they armed like their Gothic counterparts.
Saiones, who were a part of the Gothic court, were responsible for affairs concerning the king's own people, the Goths, such as serving as protectors for officials, arresting criminals, recruitment for the army and navy, and overseeing the construction of forts. Civilians could also petition
saiones to intervene on their behalf in unspecified situations, for which a
saio would charge a fee.
Saiones had an array of responsibilities and were incredibly versatile due to their relationship with the king and royal court. == Organization and function ==