divert the public attention from the internal problems of the land; that is while the procedure of the Parthians and the Romans in the final years was to leave everything be as they are. The murder of Severus Alexander by his soldiers and its aftermath which resulted in disturbances in Rome, motivated Ardashir to attack Rome again. In about the years 237–238, Ardashir took Nusaybin and Harran and attacked the city Dura; then he marched toward Hatra, which was a commercial city and the center of the traffic of commercial caravans. Hatra stood hard against the Persian siege and did not fall until April or September 240; it seems that Hatra was chosen as a point for pushing and operation against Roman Mesopotamia. The fall of Hatra might have been the cause of Gordian III's wars with Persia. In the mythical-national Persian history, the Battle of Hatra and the incident of its fall is accompanied with a romantic story. According to the story, at the time of the Persian attack on Hatra, the daughter of the city's king had fallen in love with Shapur I, Ardashir's son and had him promise her marriage and then opened the gate of the city; then the Persians captured the city and destroyed it. After Shapur found out about the kindness and attention of the father towards his daughter on the wedding night, the former had her killed due to the daughter's inappreciation to that kind of father. Final years and succession Due to the difficulties in the sources, the last years and the day of Ardashir's death are not very clear. His son, Shapur probably ascended as a royal partner on April 12, 240. The time is found from the Pirchavush inscriptions in Salmas, Northwestern Iran that show Shapur's royal participation. The answer to the question if Shapur was crowned as a shah without a partner during Ardashir's life depends on the interpretation a special kind of coin. On those coins, the faces of Ardashir and Shapur are carved together. Adding Shapur to his royal position was probably Ardashir's plan to solve the succession problem without any troubles; the reason was that Ardashir had other sons and feared that they might have craved the throne like himself. About the year of Shapur's participation in reign with Ardashir, it has been written in Cologne Mani-Codex in Greek about Mani's life:When I became twenty-four years