The ancient maritime port of Tyndis, which was then a centre of trade with Ancient Rome, is roughly identified with Ponnani, Tanur, and Kadalundi-Vallikkunnu. Tyndis was a major center of trade, next only to Muziris, between the Cheras and the Roman Empire.[23] The River Bharathappuzha (River Ponnani) had importance since Sangam period (1st-4th century CE), due to the presence of Palakkad Gap which connected the Malabar coast with Coromandel coast through inland.[24]