A local government district of Middlesex 1881-1965.
It became an urban district in 1894, and a municipal borough in 1933.
It was combined with the Municipal Borough of Enfield and the Municipal Borough of Edmonton to form the present-day London Borough of Enfield.
The Wikipedia page is [1].
Film of the Charter Day here. Information on the Coat of Arms [2]
See also List of Mayors of Southgate