<P> Vikrama Samvat, an Indian calendar era beginning in 57 BCE, is associated with the legendary Vikramaditya . However, this association did not exist before 9th century CE . The earlier sources call this era by various names, including Kṛṭa, the era of the Malava tribe, or simply, Samvat . Scholars such as D.C. Sircar and D.R. Bhandarkar believe that the name of the era changed to "Vikram Samvat" after the reign of Chandragupta II, who had adopted the title Vikramaditya . </P> <P> Jyotirvidabharana (22.10), a treatise attributed to Kalidasa, states that nine famous scholars known as the Navaratnas ("nine gems") attended the court of the legendary Vikramaditya . Besides Kalidasa himself, these included Amarasimha, Dhanvantari, Ghatakarapara, Kshapanaka, Shanku, Varahamihira, Vararuchi, and Vetala Bhatta . However, there is no historical evidence to show that these nine scholars were contemporary figures or proteges of the same king . Jyotirvidabharana is considered a literary forgery of a date later than Kalidasa by multiple scholars . There is no mention of such "Navaratnas" in earlier literature, and D.C. Sircar calls this tradition "absolutely worthless for historical purposes". </P> <P> Nevertheless, multiple scholars believe that one of these Navaratnas--Kalidasa--may have indeed flourished during the reign of Chandragupta II . These scholars include William Jones, A.B. Keith, and Vasudev Vishnu Mirashi among others . </P>

Who visited india during the reign of chandragupta