The _Magister Officiorum_, whose relation to the other members of the Cabinet of the Sovereign was somewhat indefinite, and who was in fact constantly trying to enlarge the circle of his authority at their expense, was at the head of the Civil Service of the Roman Empire, and afterwards occupied a similar position in the Ostrogothic State. It was said of him by the Byzantine orator Priscus (himself a man who had been engaged in important embassies), 'Of all the counsels of the Emperor the Magister is a partaker, inasmuch as the messengers and interpreters and the soldiers employed on guard at the palace are ranged under him.' Quite in harmony with this general statement are the more precise indications of the 'Notitia.' There, 'under the disposition of the illustrious Magister Officiorum,' we find five _Scholae_, which seem to have been composed of household troops[51]. Then comes the great Schola of the _Agentes in rebus_ and their deputies--a mighty army of 'king's messengers,' who swarmed through all the Provinces of the Empire, executing the orders of the Sovereign, and earning gold and hatred from the helpless Provincials among whom their errands lay. In addition to these the four great stationary bureaux--the Scrinium Memoriae, Scrinium Dispositionum, Scrinium Epistolarum, and Scrinium Libellorum--the offices whose duty it was to conduct the correspondence of the Sovereign with foreign powers, and to answer the petitions of his own subjects, all owned the Master of the Offices as their head. Moreover, the great arsenals (of which there were six in Italy at Concordia, Verona, Mantua, Cremona, Ticinum, and Lucca) received their orders from the same official. An anomalous and too widely dispersed range of functions this seems according to our ideas, including something of the Secretaryship for Foreign Affairs, something of the Home Secretaryship, and something of the War Office and the Horse Guards. Yet, as if this were not enough, there was also transferred to him from the office of the Praetorian Praefect the superintendence of the Cursus Publicus, that excellent institution by which facilities for intercourse were provided between the capital and the most distant Provinces, relays of post-horses being kept at every town, available for use by those who bore properly signed 'letters of evection.' Thus to the multifarious duties of the Master of the Offices was added in effect the duty of Postmaster-General. It was found however in practice to be an inconvenient arrangement for the Master of the Offices to have the control of the services of the 'public horses,' while the Praetorian Praefect remained responsible for the supply of their food; and the charge of the _Cursus Publicus_ was accordingly retransferred--at any rate in the Eastern Empire--to the office of the Praefect, though the letters of evection still required the counter-signature of the Master[52].