Built in the 1440s by Henry VI's treasurer, a man called Fiennes, Herstmonceux Castle is one of the first large scale buildings in the country to be made of brick. It's not really a castle, of course- any more than the chateaux of the Loire Valley are. This was an age of artillery- and a few well-placed cannon balls would have had all that fancywork sliding into the moat. The architect may have been the same chap who designed Eton College for the King. Brick was such a new idea that workmen had to be imported from the Low Countries- and a local brick-making industry created from scratch.