Pashupata Shaivism(Sanskrit: Pāśupatas) is the oldest of the major Shaivite schools. The philosophy of Pashupata sect was systematized by Lakulish (also called Nakuliśa) in the 2nd century A.D. The main texts of the school are Gaṇakārikā, Pañchārtha bhāshyadipikā and Rāśikara-bhāshya.
The date of foundation of the school is uncertain. However, the Pashupatas may have existed from the 1st century AD. Gavin Flood dates them to around the 2nd century AD. They are also referred to in the epic Mahabharata which is thought to have reached a final form by 4th century CE. The Pashupata movement was influential in South India in the period between the 7th and 14th century, but it no longer exists.
Pashupata Shaivism was a devotional (bhakti) and ascetic movement. Pashu in Pashupati refers to the effect (or created world), the word designates that which is dependent on something ulterior. Whereas, Pati means the cause (or prinripium), the word designates the Lord, who is the cause of the universe, the pati, or the ruler. To free themselves from worldy fetters Pashupatas are instructed to do a pashupata vrata. Atharvasiras Upanishsad describes the pashupata vrata as that which consists of besmearing one's own body with ashes and at the same time muttering mantra — "Agni is ashes, Vayu is ashes, Sky is ashes, all this is ashes, the mind, these eyes are ashes.