Achala Siddhānta in the Context of Indian and South Indian Philosophical Traditions A Comparative Study of Its Distinctive Ontology, Yeruka, and the Medieval South Indian Intellectual Milieu Dr. Gururaj Guruji Abstract Achala Siddhānta is a South Indian philosophical tradition whose principal literature is preserved predominantly in Telugu and whose conceptual vocabulary includes Paripūrṇa Para Brahma, Bayalu, Yeruka, Mūla Māyā, Prakruthi and Ajāti. This study examines Achala not as a derivative of any single earlier school, but as a distinct philosophical formulation within the wider history of Indian and South Indian intellectual inquiry. Beginning with the Ṣaḍ-darśana, it considers the diversification of philosophical thought into Vedānta, Śhaiva, Veeraśhaiva, Yogic, Siddha and vernacular traditions, with particular attention to the broad period from the tenth to the fourteenth centuries. The central methodological proposition is that similarity does not establish depend...