The downfall of the Polonnaruwa kingdom, which was the administrative centre of great kings like Vijayabahu I and Parakramabahu the Great, was brought about after the reign of king Nissankamalla due to several factors. The rulers who came to power after king Nissankamalla were weak and therefore none of them were able to establish political stability. When the kingdom was going weaker in this manner, an invader named Kalinga Magha landed in Lanka with a huge army. King Parakrama Pandya who was ruling the Polonnaruwa kingdom at this time failed to resist Magha’s invasion which was launched in 1215 AD. Consequently, the invader seized power in Rajarata.