Unlike the Vedas, which are Shruti (heard), the Tantras are Smriti (remembered) texts revealed by Bhairava (Shiva) to his consort in moments of divine discourse. The Brahma Yamala is believed to have been composed roughly between the 7th and 9th centuries CE, during the peak of the Shaiva Siddhanta and early Kaula schools.
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The Brahma Yamala belongs to a group of "Yamala" tantras, which often contain secret conversations between deities and their consorts. Other notable texts in this category include: Brahma Yamala Tantra Pdf