http://www.gita-society.com/temple/H...as16.htm#shiva

THE GREATNESS OF PRANAV MANTRA

Regarding the methods of Shiva's worship, Kartikeya told Vamadeva that though Sadashiva was one, yet he was known by various names like Maheshwar, Rudra, Brahma and Vishnu. Mahesh was created from the thousandth part of Sadashiva. The goddess of all illusions - Bhagawati dwells in the left side of Sadashiva, therefore he is the lord of all the actions of the universe. Sadashiva plays his desire acts by indulging in creation, nurturement and annihilation of this world