The Sinhalese chronicles, such as "Culavamsa", "Rajavaliya" and a number of Sandesya chronicles, such as "Kokila Sandesaya" and "Selalihini Sandesaya", have valuable information on the early and middle period of the kingdom, its activities and its eventual occupation by the rival Kotte Kingdom in 1450–1467. "Culavamsa" mentions in detail the arrival and the conquest of the Sinhalese capital Yapahuwa by a minister named Aryacakravarti during the period 1277 to 1283. It also mentions that the minister carried away the Budha's relic from the capital to Pandyan Kingdom. The "Rajavaliya" a primary source written during the 17th century refers to the fact that the Aryacakravartis collected taxes from Udarata and southern lowlands. The conquest by a certain Sapumal Kumaraya, a military leader sent by the Kotte king, seemed to have left an indelible impression on the Sinhalese literati. The victory of Sapumal Kumaraya is sung in the "Kokila Sandesaya" ("Message carried by Kokila bird") written in the 15th century by the principal monk of the Irugalkula Tilaka Pirivena in Mulgirigala. The book contains a contemporary description of the country traversed on the road by the cookoo bird from Devi Nuwara ("City of Gods") in the south to Nallur ("Beautiful City") in the North of Sri Lanka. Parakramabahu V (1344–59) a king of Gampola who ruled from Dedigama retreated to the southeast of the island, to a place called Magul Maha Viharaya in the Ampara District after a confrontation with the Aryacakravarti. This is evident from inscriptions in a place called Lahugala. The Medawala inscriptions dated 1359 found near a bo-tree at Medawala in Harispattuva reveal that Martanda Cinkaiariyan appointed tax collectors to collect taxes from the villages belonging to the Gampola kingdom. The Kotagama inscriptions found in Kegalle District are a record of victory left by the Aryacakravarti kings of the Jaffna Kingdom in western Sri Lanka. The inscription was assigned to the 15th century by H.C.P. Bell, an archeologist, and Mudaliar Rasanayagam, based on paleographic analysis of the style of letters used.