 The City was incorporated as a municipal borough in 1874; from 1888, it fell within the jurisdiction of the Soke of Peterborough county council and from 1965, Huntingdon and Peterborough county council.In 1974, it was replaced by a wholly new non-metropolitan district, broadly corresponding to the Soke, in the new enlarged Cambridgeshire.In 1998, Peterborough became independent of Cambridgeshire as a unitary authority, but the city continues to form part of that county for ceremonial purposes as defined by the Lieutenancies Act 1997.