acknowledgement of Roman hegemony by various tribes in the Caucasus and on the Eastern coast of the Black Seaa process that kept him busy until the end of 114. At the same time, a Roman column under the legate Lusius Quietusan outstanding cavalry general who had signalled himself during the Dacian Wars by commanding a unit from his native Mauretaniacrossed the Araxes river from Armenia into Media Atropatene and the land of the Mardians (present-day Ghilan). It is possible that Quietus' campaign had as its goal the extending of the newer, more defensible Roman border eastwards towards the Caspian Sea and northwards to the foothills of the Caucasus. This newer, more "rational" frontier, depended, however, on an increased, permanent Roman presence east of the Euphrates. The chronology of subsequent events is uncertain, but it is generally believed that early in 115 Trajan launched a Mesopotamian campaign, marching down towards the Taurus mountains in order to consolidate territory between the Tigris and Euphrates rivers. He placed permanent garrisons along the way to secure the territory. While Trajan moved from west to east, Lusius Quietus moved with his army from the Caspian Sea towards the west, both armies performing a successful pincer movement, whose apparent result was to establish a Roman presence into the Parthian Empire proper, with Trajan taking the northern Mesopotamian cities of Nisibis and Batnae and organizing a province of Mesopotamia, including the Kingdom of Osrhoenewhere King Abgar VII submitted to Trajan publiclyas a Roman protectorate. This process seems to have been completed at the beginning of 116, when coins were issued announcing that Armenia and Mesopotamia had been put under the authority of the Roman people. The area between the Khabur River and the mountains around Singara seems to have been considered as the new frontier, and as such received a road surrounded by fortresses. After wintering in Antioch during 115/116 and, according to literary sources, barely escaping from a violent earthquake that claimed the life of one of the consuls, Marcus Pedo VirgilianusTrajan again took to the field in 116, with a view to the conquest of the whole of Mesopotamia, an overambitious goal that eventually backfired on the results of his entire campaign. According to some modern historians, the aim of the campaign of 116 was to achieve a "pre-emptive demonstration" aiming not toward the conquest of Parthia, but for tighter Roman control over the Eastern