Chester Square is a small residential garden square located in London's Belgravia district. Along with its sister squares Belgrave Square and Eaton Square, it is one of the three garden squares built by the Grosvenor family when they developed the main part of Belgravia in the 19th century.Chester Square is named after the city of Chester, near to which Eaton Hall – the ancestral home of the Grosvenor family – is situated.