Derry was to play a unique part in plantation plans. James I and his ministers cajoled the City of London and its wealthy guild companies to fortify and plant the region now to be designated the county of Londonderry, formerly the County of Coleraine. The Irish Society, specially formed for the purpose, was to take charge of the towns, customs and fisheries with the rest of the county devolved to the companies in twelve proportions. As a major part of its responsibilities the Society were obliged to build a new walled town on the site of the Derrie. In recognition of the part played by the city of London the prefix London was added to the old name. A new charter for the new city of Londonderry was issued. Between 1614 and 1618 the Walls encircling the site of the new plantation city were complete. The beginnings were made in building the last walled town and the first planned town in Ireland.