The Three Crowned Kings, or the Three Glorified by Heaven, or World of the Three refers to the triumvirate of Chola, Chera and Pandya who dominated the politics of the ancient Tamil country, Tamilakam, from their three countries or Nadu of Chola Nadu, Pandya Nadu (present day Madurai and Tirunelveli) and Chera Nadu (present day Kerala). They signaled a time of integration and political identity for the Tamil people. They would frequently wage war against one another under a period of instability till the Imperial period of the Rajaraja I who united Tamilakam under one leadership.