Analysis of information sources in references of the Wikipedia article "Wangsa Pandya" in Malay language version.
That after the fifth century A D . Jainism became so very influential and powerful as to even become the state-creed of some of the Pandyan kings.
Kings of the Chola and Pandya dynasties also issued Tamil and bilingual Sanskrit–Tamil inscriptions.
Thus the state language was Tamil whether the inscriptions were from the north or the south and whether the dynasty was Gupta, Vakatak[a], Vardhana, Maukhari, Pratihara, Paramara, Chandella, Pala, Sena, Gahadavala, Haihaya, Ganga, Pallava, Chola, Pandya, Chalukya, Rashtrakuta, or Vijayanagar[a]. Inscriptions were sometimes written in regional languages, but they invariably had a preface in Sanskrit.
