The Tamil Society had of cource under the religious and cultural influences of the North even before the beginning of the Cankam Age but had maintained its linguistic identity.From what we now know of the linguistic prehistory of India,it is more plausible to assume that the Yadavas were the Aryanised descendants of an original Non-Aryan people that to consider the Tamil Velir as the later offshoot of the indo-Aryan speaking Yadavas.
The Yadavas were initially ruling under the Chalukyas of Kalyani over region of modern Dhulia and Nasik districts with their capital at Chandradityapura (modern Chandor, Nasik district).
Innumerable Kshatriyas invincible in war, belonging to the eighteen younger branches of the Yadavas, were employed in defending these works.
The Yadavas and Chauhans were the last to perform a coronation but whether they performed Indrabhishek ceremony is not clear.
Jarasandha was a threat not only for Yadavas but also for Kurus.