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).
Uttara Kalamrita
There is a Shankara Vijaya attributed to Madhava Vidyaranya, but the next clearly states that the author was condensing the work of Vyasachala (17th century) and that he was called Abhinava Kalidasa. Possibly the author of Uttara Kalamrita is the same one.
The Uttara Kalamrita contains a wealth of astrological principles which are derived from earlier works on astrology namely Brihat Parashara Hora Shastra, Brihat Jataka & Phaladeepika.