Pashupata Shaivism (Pāśupata, Sanskrit: पाशुपत) is the oldest of the major Shaivite Hindu schools

The mainstream which follows Vedic Pasupata penance are ‘Maha Pasupatas’ and the schism of ‘Lakula Pasupata’ of Lakulisa

There is a debate about pioneership of this schism and the Goan school of Nakulish darshan believes that Nakulish was pioneer and Lakulish and Patanjalinath were his disciples while Gujarat school believes that Nakulish and Lakulish are one

Sarvadarśanasaṅgraha written by Vidyaranya (sometimes also known as Madhavacharya) mentions it as “Nakulish Darshan” not as “Lakulish Darshan”

Both sub schools are still active in their own areas

The philosophy of the Pashupata sect was systematized by Lakulīśa also called Nakulīśa) in the 2nd century CE

The main texts of the school are Pāśupatasūtra with Kauṇḍinya’s Pañcārthabhāṣya, and Gaṇakārikā with Bhāsarvajña’s Ratnaṭīkā

Both texts were discovered only in the twentieth century

Prior to that, the major source of information on this sect was a chapter devoted to it in Vidyāraṇya’s Sarvadarśanasaṅgraha