![]() ![]() ![]() This is probably when the first earth rampart and timber palisade defences were built around this part of the city. The first reference to defences on the east side of the River Foss is to Walmgate Bar in 1155. It shows the medieval city walls surrounding Walmgate from Fishergate Tower to Red Tower, each ending next to the waters of the flooded river Foss. A map of 1610 by John Speed shows how the water provided a very effective defence as it spread over low ground to the east of the city and also some distance up Tang Hall Beck. In 1068, William the Conqueror dammed the River Foss at Fishergate, raising the water level by approximately 2m, flooding the moat of his new castle and creating a large lake known as the King’s Fishpond. Formerly the Tower was known as Brimstone House after a manufactory carried on within its walls. ![]() ![]() This Tower marks the termination of the City Wall, and at one time marked the commencement of an impassable swamp, which extended to Layerthorpe Postern, the position of which was near the existing Layerthorpe Bridge the Tower suffered severely in the siege of 1644 and has undergone many restorations since that period rendered necessary by the nature of the ground on which the foundations are laid. ![]()
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