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The Iazyges also had a strong relationship with the Roxolani, another Sarmatian tribe, both economically and diplomatically. During the second Dacian War, where the Iazyges supported the Romans, while the Roxolani supported the Dacians, the Iazyges and Roxolani remained neutral to each other. After the Roman annexation of Dacia, the two tribes were effectively isolated from each other, until the 179 peace concession from Emperor Marcus Aurelius which permitted the Iazyges and Roxolani to travel through Dacia, subject to the approval of the governor. Because of the new concession allowing them to trade with the Roxolani they could, for the first time in several centuries, trade indirectly with the Pontic Steppe and the Black Sea. It is believed the Iazyges traveled through Small Wallachia until they reached the Wallachian Plain, but there is little archeological evidence to prove this. Cypraea shells began to appear in this area in the last quarter of the 2nd century.