This castle held the Coyanza Council in 1050; the old Coyanza was populated and fortified by Fernando II of León in the second half of the 12th century. The current castle was built in the 15th century. It was constructed on the site of older castle that had been erected on the ruins of a fortification dating back to the Iron Age.
The castle consists basically of one articulated front with projections, flanked by turrets overshadowing the tower of homage, with round turrets in the Gales and fronts.
Built around AD 90 to entertain the legionaries stationed at the fort of Caerleon (Isca), the impressive amphitheatre was the Roman equivalent of today’s multiplex cinema. Wooden benches provided seating for up to 6,000 spectators, who would gather to watch bloodthirsty displays featuring gladiatorial combat and exotic wild animals.
Long after the Romans left, the amphitheatre took on a new life in Arthurian legend. Geoffrey of Monmouth, the somewhat imaginative 12th-century scholar, wrote in his History of the Kings of Britain that Arthur was crowned in Caerleon and that the ruined amphitheatre was actually the remains of King Arthur’s Round Table.
Today it is the most complete Roman amphitheatre in Britain.