The Cochin–Travancore Peace Treaty came to being in 1761 to expel the forces of the Zamorin of Calicut from the regions of the Kingdom of Cochin they had occupied in 1755-56. The alliance said that if the king of Travancore helps to regain the occupied territories, they can continue to keep the portions of Cochin they annexed during a period between 1755 and 1756. The famous Travancore Defence Lines were built as a result of this peace agreement.