Archaeological remains found in the region of Mathura support the fact that the popularity of these two divine figures had reached its zenith in the Mauryan and the Shunga period and associated Bhagavata religion had become widespread throughout Mathura and Western India areas. This period coincides with the large migrations of Jainas from Magadha to Mathura. Baladeva is referred to by Jaina Puranas as Halabhrit, without any support from Brahminical texts. All the Vasudevas are modeled after the description of Krishna found in the Puranas. They are called blue-black (nila) in complexion and are designated by several names that are normally applied exclusively to Krishna e.g. Keshava, Madhava, Govinda, Vishnu and Narayana (which is used as synonym for the name Vasudeva). List of opposites (or prati categories) include most of the names associated with Asuras in Puranas.