A brother of Sena I and his Ādipāda. During the king’s absence from the capital, he married Nālā, daughter of his maternal uncle, and took her to Pulatthinagara, but the king forgave him and later, when his elder brother Mahinda died, made him Mahādipāda, sending him as ruler of the Southern Province. Soon after, however, Udaya fell ill and died (Cv.l.6, 8, 44, 45). According to an inscription, he had a son who, under Kassapa IV, became Mahālekhaka. See Cv. Trs.i.138, n.3 and 142, n.1.