In another part of the code of Justinian, the trade between the Romans and Persians is regulated: the places were the fairs and markets are to be kept are fixed and named; these were near the confines of the two kingdoms; and these confines neither party was allowed to pass. From a law of the emperor Constans, inserted in the Theodosian code, it appears that some of the ships which came from Spain to Rome were freighted for the service of the state; and these are particularly regulated and privileged in this law. There were several laws made also respecting the fleet which the emperors employed for the purpose of collecting the tribute and revenue, and conveying it to Home and Constantinople. The law of the emperors Leo and Zeno, which is inserted in the Justinian code, mentions the fleet which was kept to guard the treasures: and by another law, taken from the Theodosian code, we learn, that the guards of the treasures, who went in this fleet, were officers under the superintendent of the imperial revenue. 3. We have already mentioned the dependence of Rome on foreign nations for corn, and the encouragement given, during the republic and in the early times of the empire, to the importation of this necessary article. In the Theodosian and Justinian code, encouragement to the importation of it seems still to have been a paramount object, especially from Egypt; for though from an edict of Justinian it would appear that the cargoes from this country, of whatever they consisted, were guarded and encouraged by law, yet we know that the principal freight of the ships which traded between Alexandria and Rome and Constantinople was corn, and that other merchandize was taken on board the corn fleets only on particular occasions, or, where it was necessary, to complete the cargoes. Among the other edicts of Justinian, regulating the trade of Egypt, there is one which seems to have been passed in consequence of the abuses that had crept into the trade of corn and other commodities, which were shipped from Alexandria for Constantinople. These abuses arose from the management of this trade being in the hands of a very few persons: the emperor therefore passed a law, dividing the management into different branches, each to be held by separate individuals. From the code of Justinian we also learn, that corn was embarked from other ports of Egypt besides Alexandria, by private merchants; but these were not permitted to export it without permission of the emperor, and even then not till after the imperial fleet was fairly at sea. The importance of the corn trade of Egypt fully justified these laws; for at this period Constantinople was annually supplied with 260,000 quarters of wheat from this country.