This section is from the book "Some Contributions Of South India To Indian Culture", by S. Krishnaswami Aiyangar. Also available from Amazon: Some Contributions of South India to Indian Culture.
After all this theory of a Chola interregnum in the fifth century rests upon the flimsy foundation of the eleventh century information that a Trilochana Pallava reclaimed the forest country of the ceded districts and started a dynasty of the Pallavas from whom the later rulers of the locality claimed descent. This reclamation of the forest country is clearly indicated to have been the achievement of the first important member of the Pallava Prakrit charters who is given no name and who is credited with having bestowed crores of money and a hundred thousand ox ploughs. Nothing could be clearer than this statement in regard to the reclamation of the forest country by him. The fact that he is referred to only by the term Bappadeva (revered father) and not by any other specific name points to the fact that his services were specially distinguished in regard to this matter, and that he left such a deep impression upon the people that it was hardly necessary he should be defined by a specific name. Although Dr. Hultzsch attempted another explanation of the expression occurring in the Uruvapalli plates in regard to Simha-varman II that he was "a worshipper at the feet of the Bhattaraka Maharaja Bappadeva" as meaning his father, it will bear the interpretation that the Bappadeva described as the Bhattaraka Maharaja is the Bappadeva of the Prakrit charters, the founder of the authority of the Pallavas in the Telugu districts. The objection to Dr. Hultzsch's interpretation quite justifiable in regard to later documents, is, in regard to this particular document, that Vishnugopa was not a Maharaja and could not perhaps exactly be described as Bhattaraka Maharaja. There is no indication of a reason for the departure in respect of him particularly. If Trilochana Pallava were regarded by later tradition to be credited with having cleared the forest country to turn it into occupied land, here was Bappadeva's work which later tradition might indicate as that of Trilochana Pallava. It is just possible that Bappadeva's name was some equivalent of Trilochana (Siva) taking the fact that his son called himself Sivaskanda-Varman into consideration. If he bore anything like the name Siva he could be spoken of as Trilochana and the late tradition seems to be an echo of the achievement of Bappadeva himself.
On palaeographical considerations above the Prakrit charters have to be regarded earlier than the southward march of Samudragupta, that is about A.D. 350; Samudragupta's date being known it is impossible to bring either of the two Vishnugopas that figure in the genealogical table to a date about A.D. 350. Vishnugopa of Kanchi, the contemporary of Samudragupta, must have been a ruler different from the two Vishnugopas of the later table. Therefore then after the Satavahanas, we have the Pallava dynasty or dynasties of the Prakrit charters, then follows the reign of Vishnugopa, and then the dynasty of the Sanskrit charters to whose history actually we shall now turn.