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).
Kaliyan
After hearing this, Shiva asked Chitra Buthira to tell about Kali's lifespan, qualities, and power. Chitra Buthira responded with a narrative. Buthira said, "Because [Kali] was born without the instrumentality of normal human parentage, all the 96 Tatvas in his physique are rude and unrefined. Also, because of his unusual birth, he would have his intelligence and five senses rooted in falsehood. His eyes, legs and head will lead Kali towards sin. His nature is not knowing the true nature of the things here. He will have a life span of about a hundred years, and he will attain maturity at the age of fourteen. He will have about ten hundred thousand drops of semen in his body." (Some sources claim this as 10 lakh drops of blood, not semen). "He will attain full bodily maturity at the age of 31. Kali's body, which was built up with blood, bone, veins and muscle, are made of water and earth, and this is used for nothing (useless). His body will have 9 openings outside. This toy (i.e., body) will be controlled by a bird (i.e., soul), and when it’s time for the bird to go, it will fly away, leaving the toy here, and thereby the bird will have no relation with the toy. This bird and the body is free for him in this yuga. And until the bird is with him, Kali's savageness cannot be tolerated. Since his nature is like this, and since he is built up of savageness, he will not be thankful."