It is however subject to conjecture whether the pre-historic Negritos 12,000 to 15,000 years age or the much later waves of Austronesian seafarers from 5,000 to 300 B.C. were able to settle along the coasts of Batangas into the inner lake region of Taal which was accessible to navigation through the Pansipit River, thus, the possibility of miscegenetic marriages and cross culture among the aboriginal inhabitants, the old settlers and the latter Dumangsil and Balkasusa Clans. Or whether violent wars had been waged between old inhabitants and new colonizers is uncertain too, incontrovertible proofs being wanting.