The sixteenth century in south India witnessed enormous output of literature composed in Sanskrit on many subjects and systems of philosophy. Sivagrayogi was a very great Saivasiddhanta teacher belonging to this period who had enriched the Saivasiddhanta literature by composing many independent texts as well as commentaries. Some of them are voluminous and they have been exerting great sway among the devotees and learned scholars. This seminar will analyse briefly his contribution for the development of Sivasiddhanta during the pre-modern period.