Pliny's geography of the north is the most full and curious of all antiquity. After describing the Hellespont, Moeotis, Dacia, Sarmatia, ancient Scythia, and the isles in the Euxine Sea, and proceeding last from Spain, he passes north to the Scythic Ocean, and returns west towards Spain. The coast of part of the Baltic seems to have been partly known to him; he particularly mentions an island called Baltia, where amber was found; but he supposes that the Baltic Sea itself was connected with the Caspian and Indian Oceans. Pliny is the first author who names Scandinavia, which he represents as an island, the extent of which was not then known; but by Scandinavia there is reason to believe the present Scandia is meant. Denmark may probably be rcognised in the Dumnor of this author, and Norway in Noligen. The mountain Soevo, which he describes as forming a vast bay called Codanus, extending to the promontory of the Cimbri, is supposed by some to be the mountains that run along the Vistula on the eastern extremity of Germany, and by others to be that chain of mountains which commence at Gottenburgh. The whole of his information respecting the north seems to have been drawn from the expeditions of Drusus, Varus, and Germanicus, to the Elbe and the Weser, and from the accounts of the merchants who traded thither for amber.
Tacitus, who died about twenty years after Pliny, seems to have acquired a knowledge of the north more accurate in some respects than the latter possessed. In his admirable description of Germany, he mentions the Suiones, and from the name, as well as other circumstances, there can be little doubt that they inhabited the southern part of modern Sweden.
The northern promontory of Scotland was known to Diodorus Siculus under the name of Orcas; but the insularity of Britain was certainly not ascertained till the fleet sent out by Agricola sailed round it, about eighty-four years after Christ. Tacitus, who mentions this circumstance, also informs us, that Ireland, which was known by name to the Greeks, was much frequented in his time by merchants, from whose information he adds, that its harbours were better known than those of Britain: this statement, however, there is much reason to question, as in the time of Cæsar, all that the Romans knew of Ireland was its relative position to Britain, and that it was about half its size.
The emperor Trajan, who reigned between A.D. 98 and A.D. 117, was not only a great conqueror, carrying the Roman armies beyond the Danube into Dacia, and into Armenia, Mesopotamia, and Assyria, and thus extending and rendering more accurate the geographical knowledge of his subjects; but he was also attentive to the improvement and commercial prosperity of the empire. He made good roads from one end of the empire to the other; he constructed a convenient and safe harbour at Centum Cellæ (Civita Vecchia), and another at Ancona on the Adriatic: he dug a new and navigable canal, which conveyed the waters of the Nahar-Malcha, or royal canal of Nebuchadnezzar, into the river Tigris; and he is supposed to have repaired or renewed the Egyptian canal between the Nile and the Red Sea. He also gave directions and authority to Pliny, who was appointed governor of Pontus and Bithynia, to examine minutely into the commerce of those provinces, and into the revenues derived from it, and other sources.
The emperor Adrian passed nearly the whole of his reign in visiting the different parts of his dominions: he began his journey in Gaul, and thence into Germany; he afterwards passed into Britain. On his return to Gaul, he visited Spain; on his next journey he went to Athens, and thence into the east; and on his second return to Rome, he visited Sicily; his third journey comprised the African provinces; his fourth was employed in again visiting the east; from Syria he went into Arabia, and thence into Egypt, where he repaired and adorned the city of Alexandria, restoring to the inhabitants their former privileges, and encouraging their commerce. On his journey back to Rome, he visited Syria, Thrace, Macedonia, and Athens. By his orders, an artificial port was constructed at Trebizond on a coast destitute by nature of secure harbours, from which this city derived great wealth and splendour.
The only writer in the time of Adrian, from whom we can derive any additional information respecting the geography and trade of the Romans, is Arrian. He was a native of Nicodemia, and esteemed one of the most learned men of his age; to him we are indebted for the journal of Nearchus's voyage, an abstract of which has been given. His accuracy as a geographer, is sufficiently established in that work, and indeed, in almost all the particulars respecting India, which he has detailed in his history of the expedition of Alexander the Great; and in his Indica, which may be regarded as an appendix to that history. He lived at Rome, under the emperors Adrian, Antoninus, and Marcus Aurelius, and was preferred to the highest posts of honour, and even to the consulship. In the year A.D. 170, he was appointed governor of Pontus, by Adrian, for the special purpose of opposing the Alani, who were invading that part of the empire. His situation and opportunities as governor, enabled him to derive the most accurate and particular information respecting the Euxine Sea, which he addressed in a letter to Adrian; this Periplus, as it is called, "contains whatever the governor of Pontus had seen, from Trebizond to Dioscurias; whatever he had heard from Dioscurias to the Danube and whatever he knew from the Danube to Trebizond."
The letter begins with the arrival of Arrian at Trebizond, at which place, the artificial port already noticed was then forming. At Trebizond he embarked, and surveyed the eastern coast of the Euxine Sea, visiting every where the Roman garrisons. His course led him past the mouth of the Phasis, the waters of which, he remarks, floated a long time on those of the sea, by reason of their superior lightness. A strong garrison was stationed at the mouth of this river, to protect this part of the country against the Barbarians; he adds, however, in his letter, that the new suburbs which had been built by the merchants and veterans, required some additional defence, and that he had, accordingly, for the greater security of the place, strengthened it with a new ditch: he ended his voyage at Sebastapolis, the most distant city garrisoned by the Romans. The description of the coasts of Asia, from Byzantium to Trebizond, and another of the interior, from Sebastapolis to the Bosphorus Cimmerius, and thence to Byzantium, is added to his voyage. The great object of this minute and accurate survey was to enable the emperor to take what measures he might deem proper, in case he designed to interfere in the affairs of the Bosphorus, as well as to point out the means of defence against the Alani, and other enemies of the Roman power.
We have contented ourselves with this short abstract of the Periplus of the Euxine, because we have already given all the important information it contains on the subject of the commerce of this sea. It is very inferior in merit to the Periplus of the Euxine, which has also been attributed to this Arrian, though Dr. Vincent, we think, has proved that it is the work of an earlier writer, and of a merchant.
As the Roman conquests extended, their geographical knowledge of course increased. In the reign of Antoninus Pius, their armies had forced a passage much further north in Britain than they had ever ventured before. One of the results of this success was a maritime survey, or rather two partial surveys of the north part of Britain, from which the geography of that part of the island was compiled by Ptolemy.
The maritime laws of the Rhodians, or those which passed under their name, seem to have been the basis and authority of the Roman maritime laws at this period; for we are told, that when a merchant complained to the emperor that he had been plundered by the imperial officers at the Cyclades, where he had been shipwrecked, the latter replied, that he indeed was lord of the earth, but that the sea was governed by the Rhodian laws, and that from them he would obtain redress. This part of the Rhodian law, however, had been but lately adopted by the Romans; for Antoninus is expressly mentioned as having enacted, among other laws, that shipwrecked merchandize should be the entire property of the lawful owners, without any interference or participation of the officers of the exchequer, and that those who were guilty of plundering wrecks should be severely punished.