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).
Rama
Another historically and chronologically important text is "Raghuvamsa" authored by Kalidasa. Its story confirms many details of the "Ramayana", but has novel and different elements. It mentions that Ayodhya was not the capital in the time of Rama's son named Kusha, but that he later returned to it and made it the capital again. This text is notable because the poetry in the text is exquisite and called a "Mahakavya" in the Indian tradition, and has attracted many scholarly commentaries. It is also significant because Kalidasa has been dated to between the 4th and 5th century CE, suggesting that the Ramayana legend was well established by the time of Kalidasa.