The Samadhirajasutra is one of the essential canonical texts of the Mahayana Buddhism. Dating from perhaps the second century it presents and early form of the doctrine of the void (sunyavada) one of the principal philosophical doctrines of the Mahayana. In this respect the Sutra is of fundamental philosophical importance; it is notably of major auhtority for the Madhyamaka school which is sunyavada par excellence.