Ponnaiyah Ramajayam Institute of Science and Technology (PRIST) is a private and deemed university in Vallam Thanjavur, India. The institute was founded in 1985 by Prof. P. MurugesanThe Thanjavur West Campus is the main campus. It covers more than 100 acres of land with a built-up area of over 1,500,000 square feet (or 150,000 square metres).