The origins of Brahma in Buddhism and other Indian religions are uncertain, in part because several related words such as one for metaphysical Ultimate Reality (Brahman), and priest (Brahmin) are found in the Vedic literature.
In Hindu literature, one of the earliest mention of deity Brahma with Vishnu and Shiva is in the fifth Prapathaka (lesson) of the Maitrayaniya Upanishad, probably composed in late 1st millennium BCE, after the rise of Buddhism [REF].