[12][13] The information about Yadava rulers of Simhapura in the Yamuna valley is extracted from Lakhmandal inscription of princess Ishvara.

There has been mentioned of Simhapura kingdom, which spread from the Giri/Tonse river to the Ganga and from Lakhmandal to Ambala and Saharanpur in the plains.

According to D.C Ganguly, Vajravarman seems to have invaded southeastern Bengal from Orissa, probably following the same route as Rajendra Chola's army.

[15] It is quite likely that the Vajravarman accompanied Karna, stayed in Bengal, and at an opportune moment carved out an independent Kingdom for themselves.

[19] The only record mentioning Vajra Varman's name is the Belava inscription, which praised him only as a poet, brave warrior, and an intellectual.

Though the Kaivarta regime there did not suffer any loss, a part of Buddhist monastery of Somapura was destroyed by fire set by Jatavarman's army.

Jatavarman's marriage with Karna's daughter Virashri was significant and was perhaps a great factor in the rise of the political fortunes of the Varman Dynasty.

His name figures prominently in the genealogical accounts of the Vaidik Brahmins, who are said to have migrated to Bengal from Madhyadesha during his reign.