The exact year, and even the century of the Upanishad composition is unknown. Scholars have offered different estimates ranging from 900 BCE to 600 BCE, all preceding Buddhism. "Brihadaranyaka" is one of the first Upanishads, along with that of "Jaiminiya Upanishad" and "Chandogya Upanishads". The "Brihadaranyaka Upanishad" was in all likelihood composed in the earlier part of 1st millennium BCE, around 700 BCE, give or take a century or so, according to Patrick Olivelle. It is likely that the text was a living document and some verses were edited over a period of time before the 6th century BCE.