In the 9th century, the Cholas and the Pandyas defeated Pallavas. By the 10th century, the Cholas had established a big empire, covering most of south India and Sri Lanka. They had a strong navy, That reached Thailand, Burma and Sumatra. They also had a strong trading links with China. By the 12th – 13th centuries, the power of the Cholas had declined. For some time, Pandyas became powerful. However, by that time Muslim rulers invaded Tamil lands. The Pandya dynasty came to an end by the 16th century.