 The merger leading to the establishment of the corporation, was between the municipalities of Ernakulam, Mattancherry and Fort Kochi, along with that of the Willingdon Island, four panchayats (Palluruthy, Vennala, Vyttila and Edappally), and the small islands of Gundu and Ramanthuruth.Kochi and Ernakulam district formed on 1 April 1958 carving areas of erstwhile Travancore-Kochi-Malabar kingdoms.Major portion of the district is from the Kochi kingdom.