Krishnan was born in a small village named Rappal, in Thrissur district, then in the Kingdom of Cochin and now in the South Indian state of Kerala on 22 September 1911.
On September 22, 1911, Krishnan was born in a small village named Rappal, which was then located within the Thrissur district of Cochin Kingdom and is now part of the South Indian state of Kerala.