Yamunacharya is the grand -Acharya (Pracharya ) of Ramanujacharya (1017 AD to 1137 AD). He established the principles of Visisht Adhvaita as an expansion of the doctrines housed in his grandfather’s treatises and elaborated on those doctrines with authoritative scriptures such as Sruthis, Bhagavadh Gita , Azhwar’s pasurams and Selected Satvika Puranas