Pashupati
Pashupati (Sanskrit Paśupati) is an incarnation of the Hindu god Shiva as "lord of the animals". He is revered throughout the Hindu world, but especially in Nepal, where he is unofficially regarded as a national deity.
Etymology
Paśupati "Lord of all animals" was originally an epithet of Rudra in the Vedic period and now is an epithet of Shiva. The Rigveda has the related term paśupa "cattle-keeping" as an epithet for Pushan.
The Deity
Pashupatinath is an avatar of Shiva, one of the Hindu Trinity. He is the male counterpart of Shakti.
The five faces of Pashupatinath represent various incarnations of Shiva; Sadyojata (also known as Barun), Vamdeva (also known as Uma Maheswara), Tatpurusha, Aghor & Ishana. They face West, North, East, South and Zenith respectively, and represent Hinduism's five primary elements namely earth, water, air, light and ether.
Puranas describe these faces of Shiva as
Pashupatinath in Nepal
Though Nepal is an officially secular state, its population is predominantly Hindu, and Lord Shree Pashupatinath is revered as a national deity. The Pashupatinath Temple, located at the bank of the river Bagmati, is considered the most sacred place in Nepal. The mythology hold that Lord Pashupatinath started living in Nepal in the form of a deer, when he saw the Kathmandu Valley and was overwhelmed by its beauty.