Kālidāsa
The most popular theory is that Kalidasa flourished during the reign of Chandragupta II, and therefore lived around 4th-5th century CE. Several Western scholars have supported this theory, since the days of William Jones and A. B. Keith. Many Indian scholars, such as Vasudev Vishnu Mirashi and Ram Gupta, also place Kalidasa in this period. According to this theory, his career might have extended to the reign of Kumaragupta I (r. 414 – 455 CE), and possibly, to that of Skandagupta (r. 455 – 467 CE).
Kalika Purana
References to Kālidāsa and Magha suggests that it is not one of the early Puranas. The mention of places and events associated with Ratna Pala (920-960) of Bengal region places the text to after the 10th-century. The explanation in the text for the "Mlechchha" population, and the indication of a parallel explanation in Harjaravarman's (815-832) Hyunthal copper plate inscription places the text closer to his reign. According to Rocher, the mention of king Dharmapala of Kamarupa has led to proposals of Kalika Purana being an 11th or 12th-century text. However, estimates for different sections of the text range from 7th to end of 11th-century.