The Three Crowned rulers, or the Three Glorified by Heaven, or World of the Three or The Tamil Kings, primarily known as Muvendar, refers to the triumvirate of Chera, Chola and Pandya who dominated the politics of the ancient Tamil country, Tamilakam, from their three Nadu (countries) of Chola Nadu, Pandya Nadu (present day Madurai and Tirunelveli) and Chera Nadu (present day Kerala and some parts of Tamilnadu) in southern India. They signalled a time of integration and political identity for the Tamil people. They frequently waged war against one another under a period of instability and between each other, held control over Greater Tamilakam from 6th century BCE to the 13th century.