This document summarizes the ruling centers in Sri Lanka following the fall of the Polonnaruwa Kingdom. It discusses the kingdoms of Dambadeniya, Yapahuwa, Kurunegala, Gampola, Kotte, and Jaffna that ruled at different times. The key points covered include the reasons for the fall of Polonnaruwa, the chieftains who established fortresses during that unstable period, important kings like Parakramabahu II who unified the country and developed infrastructure and trade, and the services provided by rulers of each successive kingdom.