Another impressive ruin. From Wikipedia:
“The castle was founded soon after the Norman Conquest of 1066 by William de Warenne, the first Earl of Surrey, as his most important estate in Norfolk. The settlement is strategically placed where the ancient trackway known as the Peddar’s Way crossed the River Nar. To the west of the castle was a planned town; the whole settlement was fortified. The riverside location was important both for defence and for river-borne supplies, in an age when road transport was extremely difficult.
The castle was of motte-and-bailey construction; on the summit of the motte was the residence of the owner, and the last refuge in the event of an attack. The bailey below contained living quarters, stores and workshops. A strong curtain wall with wall walks surrounds the motte summit, and a lesser wall tops the bailey banks.”