Skenfrith Castle is one of the 'Three Castles' owned by Hubert de Burgh. This castle has four sides, though not in the shape of a perfect rectangle. The central keep is circular and pictured opposite. The river Monnow passes the eastern side of the castle and a moat was dug outside the other three sides allowing the river to flow completely around and act as a very good barrier from attack. The north side of the outer wall had a gateway, but this has been destroyed.