The chronology of Brihadaranyaka Upanishad, like other Upanishads, is uncertain and contested [REF].
The chronology and authorship of Brihadaranyaka Upanishad, along with Chandogya and Kaushitaki Upanishads, is further complicated because they are compiled anthologies of literature that must have existed as independent texts before they became part of these Upanishads [REF].