Definition: the famous commentator on the Uṅādi sūtras. His work .is called Uṅādisūtravṛtti, which is a scholarly commentary on the Uṅādisūtrapāṭha, consisting of five Pādas. Ujjvaldatta is belived to have lived in the l5th century A.D. He quotes Vṛttinyāsa, Anunyāsa, Bhāgavṛtti etc. He is also known by the name Jājali.