Middle Tamil also saw a significant increase in the Sanskritisation of Tamil. From the period of the Pallava dynasty onwards, a number of Sanskrit loan-words entered Tamil, particularly in relation to political, religious and philosophical concepts. Sanskrit also influenced Tamil grammar, in the increased use of cases and in declined nouns becoming adjuncts of verbs, and phonology. The Tamil script also changed in the period of Middle Tamil. Tamil Brahmi and Vaṭṭeḻuttu, into which it evolved, were the main scripts used in Old Tamil inscriptions. From the 8th century onwards, however, the Pallavas began using a new script, derived from the Pallava Grantha script which was used to write Sanskrit, which eventually replaced Vaṭṭeḻuttu.