Nahapána cannot have lived long after the year 46. His death may be fixed about the year 50 of the era to which the three years 41, 42, and 46 belong. He was probably about 75 years old when he died. Deducting 50 from 75 we get about 25 as Nahapána's age at the beginning of the era to which the years 41, 42, and 46 belong, a suitable age for an able prince with good resources and good advisers to have established a kingdom. It is therefore probable that the era marks Nahapána's conquest of Gujarát. As said above, Nahapána was probably considered to belong to the Saka tribe, and his son-in-law clearly calls himself a Saka. It may therefore be supposed that the era started by Nahapána on his conquest of Gujarát was at first simply called Varsha; that it afterwards came to be called Sakavarsha or Sakasamvatsara; and that finally, after various changes, to suit false current ideas, about the eleventh or twelfth century the people of the Deccan styled it Sáliváhana Saka mixing it with current traditions regarding the great Sátaváhana or Saliváhana king of Paithan. If, as mentioned above, Nahapána's conquest of Gujarát and the establishment of his era be taken to come close after the conquest of Mathurá by Kanishka, the Gujarát conquest and the era must come very shortly after the beginning of Kanishka's reign, since Kanishka conquered Mathurá early in his reign. As his Mathurá inscriptions [71] give 5 as Kanishka's earliest date, he must have conquered Mathurá in the year 3 or 4 of his reign. Nahapána's expedition to and conquest of Gujarát was probably contemporary with or very closely subsequent to Kanishka's conquest of Mathurá. So two important eras seem to begin about four years apart, the one with Kanishka's reign in Upper India, the other with Nahapána's reign in Western India. The difference being so small and both being eras of foreign conquerors, a Kushán and a Saka respectively, the two eras seem to have been subsequently confounded. Thus, according to Dr. Burnell, the Javanese Saka era is A.D. 74, that is Kanishka's era was introduced into Java, probably because Java has from early times been connected with the eastern parts of India where Kanishka's era was current. On the other hand the astrological works called Karana use the era beginning with A.D. 78 which we have taken to be the Western era started by Nahapána. The use of the Saka era in Karana works dates from the time of the great Indian astronomer Varáha Mihira (A.D. 587). As Varáha Mihira lived and wrote his great work in Avanti or Málwa he naturally made use of the Saka era of Nahapána, which was current in Málwa. Subsequent astronomers adopted the era used by the master Varáha Mihira. Under their influence Nahapána's A.D. 78 era passed into use over the whole of Northern and Central India eclipsing Kanishka's A.D. 74 era. On these grounds it may be accepted that the dates in the Násik inscriptions of Ushavadáta and in