S. Thomas' College, Mount Lavinia, is an Anglican selective entry boys' private school in Sri Lanka. Started as a private school by Rt. Rev. James Chapman, the first Bishop of Colombo, in 1851, it was founded as a college and cathedral for the new Diocese of Colombo of the Church of Ceylon, modelled on British Public school tradition. An old boy of Eton College, Bishop Chapman founded the college on the Etonian model, the school's motto of "Esto Perpetuas" being derived from that of Eton College.