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).
Vikramaditya
Kalidasa is the only figure whose association with Vikramaditya is mentioned in works earlier than "Jyotirvidabharana". According to Rajasekhara's "Kāvyamimāṃsa" (10th century), Bhoja's "Sringara Prakasa" and Kshemendra's "Auchitya-Vichara-Charcha" (both 11th century), Vikramaditya sent Kalidasa as his ambassador to the Kuntala country (present-day Uttara Kannada). However, the historicity of these reports is doubtful.