 Contrary to the testimony, however, the two empires soon clashed with each other−in 296.From a Roman viewpoint, the mutual relations with Iran had been heavily strained due the aggressive and expansionistic approach of Ardashir I and Shapur I.However, the conclusive causes for the Roman offensive was possibly due to their territorial losses and the disadvantageous change in the sphere of authority and influence in the Mesopotamian-Armenian lands in the 240s and 250s.