This sastra was composed by Uyyavantha Deva Nayanar of Thiruviyalur (near Thiruvidaimaruthur) about the middle of the 12th century. It is a small work of fourty five triplets dealing with the side of spiritual experience resulting from the pursuit of Siddhantha.
The term Thiru means holy or beautiful, and Unthi is said to signify a kind of game, where an object is thrown up and played. The word Thiruvuntiyar refers to a poem which is a call and advice by the poet to his fellowmen at play in the holy game of samsara to look up to the one way of attaining salvation.
This work and Thirukkalitruppadiyar by Thirukadavur Uyyavantha Deva Nayanar are works before the time of Meykandar. It is included in the 14 Sastras of Meykandar. Thirukkalitruppadiyar is the elaborated version of Thiruvuntiyar. The period of these two works are said to be after the period of Samayakkuravargal and before the period of St Meykandar.