Medieval curtain wall.


The castle's defences were gradually strengthened and extended through the 14th century by the development of a curtain wall circuit protecting the keep. Development began with the early construction of the mantlet, and continued in an anticlockwise direction culminating in the development of the outer gatehouse and eventually the barbican. From as early as the third quarter of the 14th century the curtain wall defences included provision of artillery, positioned in turrets.