The London boroughs are the 32 local authority districts that make up the ceremonial county of Greater London; each is governed by a London borough council. The present London boroughs were all created at the same time as Greater London on 1 April 1965 by the "London Government Act 1963" and are a type of local government district. Twelve were designated as Inner London boroughs and twenty as Outer London boroughs. (The City of London, the historic centre, is a separate ceremonial county and local government district that functions quite differently from a London borough. However, the two counties together comprise the region of Greater London, all of which is also governed by the Greater London Authority.)