 Pallavas propagated Somaskanda as the principal form of worship, slightly deviating from the "Shaiva agamas"; Cholas being strict "shaivas", established "lingams" in all the temples.The relation between Shiva and the "lingam" extends to the Indus Valley civilization, where several remains, such as the round stone caps at Harappa and the well-known seal of polycelphalic "yogi" (saint), have led scholars to attribute the primordial native origin.