How old are the oldest settlements in south India? This video explores the story of the recent excavations at Keeladi, which revealed the existence of a sophisticated Tamil civilisation dating back at least to the 6th century BCE. But did you know that archaeological digs carried out over a 100 years earlier at sites like Adichanallur and Pallavaram had already hinted at human habitation sites in Tamil Nadu dating back thousands of years? How have these path-breaking excavations changed our understanding of ancient south Indian history?