1) Hindu sage 
Raikva, the poor unknown cart-driver, appears in Chapter IV of the Chandogya Upanishad where it is learnt that he knew That which was knowable and needed to be known, he knew That from which all this had originated. Along with Uddalaka, Prachinshala, Budila, Sarkarakshaya and Indradyumna, who respectively held earth, heaven, water, space and air t...