Invasion by the Kalabhras during the third century disturbed the tradition, and order of the land by displacing the three traditional ruling dynasties. These occupiers were overthrown by the Pandyas and the Pallavas, who restored the kingdoms. The Cholas, who came back from obscurity in the ninth century by defeating the Pallavas and the Pandyas, rose to become a great power and extended their empire over the entire southern peninsula. At its height the Chola empire had spread from Bengal in the northeast to Sri Lanka in the south. The Chola navy held sway over the Sri Vijaya kingdom in Southeast Asia.