Boundaries thumb|The borough lay entirely west of Roman Ermine Street (the modern A10) and included South Hornsey. The modern London Borough of Hackney was formed in 1965 by the merger of three former Metropolitan Boroughs, Hackney and the smaller authorities of Stoke Newington and Shoreditch. These Metropolitan Boroughs had existed since 1899 but their names and boundaries were very closely based on parishes dating back to the Middle Ages.
Boundaries thumb|The borough lay entirely west of Roman Ermine Street (the modern A10) and included South Hornsey. The modern London Borough of Hackney was formed in 1965 by the merger of three former Metropolitan Boroughs Hackney and the smaller authorities of Stoke Newington and Shoreditch. These Metropolitan Boroughs had existed since 1899 but their names and boundaries were very closely based on parishes dating back to the Middle Ages.