8th to 6th centuries BC The Chandogya Upanishad is compiled, significant for containing the earliest to date mention of Krishna. Verse 3.17.6 mentions Krishna Devakiputra (Sanskrit: कृष्णाय देवकीपुत्रा) as a student of the sage Ghora Angirasa. (Rig Veda indirectly mentions Krishna.)[18][unreliable source?]