Construction on Hadleigh Castle begun in about 1215 by Hubert de Burgh, but it was extensively refortified by Edward III during the Hundred Years War, becoming a favourite residence of the ageing king.

The barbican and two striking drum towers – one later used by Georgian revenue men looking out for smugglers – are part of Edward's substantial building works during the 1360s.

Today the ruins of this royal castle look out over Southend and the Essex marshes.