King of Ceylon (A.D. 133-102). He was the nephew of King Amandagámani Abhaya. Ananda was succeeded by his son Cúlábhaya and he by his younger sister Sívalí. After Sívalí had reigned for four months, Ilanaga dethroned her and became king himself. In the first year of his reign he incurred the displeasure of the powerful Lambakannas and was deprived of his throne and taken captive. It is said that the king was rescued from prison by his state elephant and that he escaped to Rohana. Three years later he gave battle to the Lambakannas at Kapallakkhanda and massacred most of them. He had the noses and toes of the rest cut off as punishment.
He was succeeded by his son Candamukha Siva. To his state elephant, who had helped him, he gave the tract of land called Hatthibhoga. During his exile in Rohana, Ilanaga built two tanks, the Tissa and the Dúra, and restored the Nágamahávihára, which he gave to Mahápaduma, thera of Tuládhára, who had preached to him the Kapi Játaka. He also gave land for its maintenance. Mhv.xxxv.14-45; Dpv.xxi.41f.