The summit of a long period of systematization of its religious philosophy shows up to have taken put in Kashmir within the tenth century, the exegetical works of the Kashmirian creators Bhatta Narayanakantha and Bhatta Ramakantha being the most advanced expressions of this school of thought. Their works were cited and imitated within the works of twelfth-century South Indian authors, such as Aghorasiva and Trilocanasiva. The religious philosophy they clarify is based on a rule of Tantric sacred texts called Siddhantatantras or Shaiva Agamas.