Svetasvatara Upanisada

The Shvetashvatara Upanishad  figures as number 14 in the Muktika canon of 108 Upanishads. It is associated with the Krishna Yajurveda. This Upanishad contains 113 mantras or verses in six chapters. It was presumably composed in the Maurya period (4th or 3rd century BCE)

The Shvetashvatara Upanishad is the earliest textual exposition of a systematic philosophy of Shaivism, for the first time elevating Rudra to the status of Īśa ("Lord"), a god with cosmological functions such as those later attributed toShiva.

The text concludes with a colophon attributing the text to "Sage Shvetashvatara" directly. The name "Shvetashvatara" is a bahuvrihi compound (Śveta-aśvatara) translating to "owner of a white mule".

There is one commentary available on this Upanishad that is attributed to Adi Shankara, but on comparison with his other commentaries, there is some doubt that is indeed composed by him. There are three other commentators, namely Vijnanatma, Shankarananda and Narayana Tirtha.