2: Both Sides of the Curtain
In earlier times the castle's outer wall was often a barrier between brothers. When Edward I constructed his massive girdle in stone around Snowdonia, the Welsh, though forced to carry on all trade within the curtain wall, could not be found there after dark. Then when tables turned and the Tudors won the English throne, every castle in the kingdom was open to the Welsh.
Professor Glanmor Williams examines the castle's role - from massive defensive outpost to elegant fortified mansion.
Film editor JOHN GILLANDERS Producer DEREK trimby
(Final programme at 1.45 tomorrow)