In the medieval period, the Ceety wis the full extent o Lunnon. The term Lunnon nou refers tae a muckle lairger conurbation roughly correspondin tae Greater Lunnon, a local government aurie which includes 32 Lunnon boroughs as well as the Ceety o Lunnon. The local authority for the Ceety, the City of London Corporation, is unique in the Unitit Kinrick, an haes some unuisual responsibilities for a local authority in Breetain, such as being the polis authority for the Ceety. It an aa haes responsibilities an awnerships ayont the Ceety's boondaries. The Corporation is heidit bi the Lord Mayor o the Ceety o Lunnon, an office separate frae (an muckle aulder than) the Mayor o Lunnon.