After the death of the second Sena king, the throne was taken by Prince Udaya. He was the one known by that name and was also the younger brother of King Sena. He conferred the title of Mahadhipadha on Kashyapa Kumara, the son of his brother, making him the crown prince, and gave Senā, the daughter of Upārāja (the fourth Kashyapa), in marriage to Kashyapa Kumara. This Kashyapa Kumara was the son of the second Sena king. From the marital connections, the relationships within the royal family can be confirmed. Nothing significant seems to have happened during King Udaya's reign. The only notable incident was that Kittu Agbo Kumara revolted against the king and fled to Rohana.

Before ascending the throne, Mahinda Adhipadha’s son had died. His mother was Kitti Kumari, who had come from Ruhuna and was the sister of the princes Kashyapa, Sena, and Udaya.

The Mahavamsa does not mention why Kittu Agbo opposed the king. He went to Ruhuna, where he killed his own followers and caused destruction in the region. It is unclear which of the three people were killed. Mr. Geiger states that it was likely the eldest, Kashyapa Kumara. He was the son of Kittu Agbo, who had been sent by the first Sena king to govern Ruhuna to resolve the initial disturbances there. Kittu Agbo Kumara, who caused the destruction, sought to become ruler of Rohana. However, the local people, angered by the destruction he caused, did not support him.

King Udaya was greatly angered by the dispute and decided what needed to be done. He called Crown Prince Kashyapa, declared him to be the rightful ruler of Ruhuna, and sent him with an army to subdue the region. He was accompanied by young Prince Mihindu, the son of the crown prince, and Vajiragga Senaviya to assist in conquering Ruhuna. Since the sons of Kittagge Bodhi Kumara, who previously ruled Ruhuna, were friends of Prince Mahinda, he had claims to rule the region.

The Mahavamsa describes this event poetically: the young prince, a great hero, advanced toward Guththahala with the army. The prince gradually reached Guththahala, a strategic post on the route from Magama to Anuradhapura. King Dutugemunu stayed here with his army. After arriving with Vajiragga Senaviya and the army, Prince Mahinda was joined by the local people and the Mandalikas who had suffered under Kittagge Bodhi Kumara’s misrule. Seeing no option under these circumstances, Kittagge Bodhi Kumara took his possessions and fled to Malaya.

According to the Mahavamsa, he stayed in the mountain region, now sometimes referred to as Kandapalle Korale. The site is mentioned in the Sellipiya near the valley below Mahawalatenna as Girimandula. The clever Kittagge Bodhi Kumara fled to this area. It is unclear whether he prepared to confront Prince Mihindu or intended to escape. It is also unclear whether he took control from Magama or from the later famous area of Manawulu.

Records indicate that he hid while moving through areas such as Ganhab. Searching for him, Prince Mahinda’s soldiers eventually captured him. By that time, his supporters had abandoned him. The army brought him from Butthala to Prince Mahinda. The prince mocked him, questioning whether he had experienced Ruhuna, as noted in the Mahavamsa. Such a situation was not expected by Kittu Agbo Kumara. However, fate had arranged it this way. Prince Mahinda handed Kittu Agbo and Vajiragga Senaviya over to the king, and then took them to Anuradhapura to deliver to the king. The king punished him.

Prince Mahinda, with his army, attempted to restore the devastated Rohana. This is a rare instance of regional history recorded in the Mahavamsa. An eight-verse strophe describes the deeds of Prince Mahinda and his father in Rohana. He restored the lands and trees damaged by the people’s neglect, cleared the four-sided area for the Sangha, and removed wicked officials and thieves, returning the administration to proper order. He eradicated enemies and thieves and brought the people to prosperity, distributing them like a well-laid canopy.

The account of Prince Mahinda mentioned above is included in the Mahavamsa. It may have been presented to illustrate both the damage caused to Rohana by Kittu Agbo Kumara and the skillful governance of Prince Mahinda. Another important note is that he diverted a branch of the Mahānadi river to build a tank. The exact river referred to as Mahānadi is unclear. Among the rivers of Rohana, the Valave Ganga seems a likely candidate. It is sometimes called the Vane River. Since irrigation has historically relied on the Valave Ganga, it is possible that this tank construction was part of that. Further, this structure could correspond to the ancient dam at Tam Katiye on the Valave Ganga. From there, a canal extended fourteen leagues to Pandukolambawatha, supplying water. This tank is currently known as Panadikulam, though it has not yet been properly identified.

From the above, it is clear that King Udaya oversaw the Rohana dispute and gave instructions to Prince Mahinda for development and restoration. The Mahavamsa records some of King Udaya’s administrative acts, including the giving of tributes. It notes that the 300,000 gold coins given to the bhikkhus as alms exceeded expectations. The king’s ability to spend such wealth indicates that the entire country recognized his authority.

The Mahavamsa further notes that the king provided food not only to his people but also to animals. He expanded the bund of the dam at Kolomba and enlarged the Meyetti tank bund. This canal began at the left bank of Malwathu Oya and supplied water to the Akattimurippu tank in the Mannar region. Meyettivapi is currently identified as the Mahavilachchiya tank. Eighteen inscriptions belonging to the king have been found, mentioning his name as Abāsalamēwan Mapurmukā. Some inscriptions describe grants of land or monasteries.

Additionally, several measures for the maintenance of hospitals are recorded. An inscription found near Malwathu Oya mentions a grant to the physician Mahaveda in Keligama. Another at Lahasugama, belonging to the Mahaveda hall at Sisorwathubima, mentions a grant. Similarly, a Tam inscription at Medirigiri, belonging to the Mahaveda hall in Sandagiriya near Anuradhapura, records grants. From these, it is evident that the second King Udaya paid special attention to the health and well-being of his people. In this way, the eleventh year of King Udaya’s reign was marked by prosperity.