Belgravia was known as the 'Five Fields' during the Tudor Period, and became a dangerous place due to and robberies. It was developed in the early 19th century by Richard Grosvenor, 2nd Marquess of Westminster under the direction of Thomas Cubitt, focusing on numerous grand terraces centred on Belgrave Square and Eaton Square. Much of Belgravia, known as the Grosvenor Estate, is still owned by a family property company, the Duke of Westminster's Grosvenor Group, although owing to the Leasehold Reform Act 1967, the estate has been forced to sell many freeholds to its former tenants.