Earlier scholars such as James Burgess have pointed out that Gautamiputra Satakarni and Nahapana were not necessarily contemporaries, since Satakarni mentions that the areas conquered by him were ruled by Ushavadata, rather than Nahapana. According to Burgess, there might have been an interval of as much as a century between the reigns of these two kings. However, most historians now agree that Gautamiputra and Nahapana were contemporaries, and that Gautamiputra defeated Nahapana. M. K. Dhavalikar dates this event to c. 124 CE, which according to him, was the 18th regnal year of Gautamiputra. R.C.C. Fynes dates the event to sometime after 71 CE, in the same line, Shailendra Bhandare places the victory of Gautamiputra and the end of Nahapana's reign to the start of Saka era, 78 CE, in the year of Chashtana's ascension to the throne, and considers Gautamiputra's whole reign to ca. 60-85 CE.