The Basilica of San Simplicio was built in the late 11th century on a small hill, once located outside the city walls, used since the Carthaginian times as a cemetery area. In the area already existed a Palaeo-Christian church, built most likely between 594 and 611, which in turn was located near a Roman temple. The apse, the walls and most of the internal columns were finished in the 11th century; the barrel vault of the aisles and the upper parts of the side walls were built in the early 12th century, while the façade was completed in the middle of that century.
The church has a façade divided into three parts by two fake columns, with a central triple mullioned window with marble columns; the small bell tower on the right is in Spanish style and is a late addition dating to the Spanish rule of Sardinia. on the left of the façade is inserted an early mediaeval marble slab from another edifice, perhaps portraying Christ entering Jerusalem, or a clash of knights.
The apse is decorated with small corbels, and is surmounted by a large pediment.
The interior, showing the granite construction of the basilica, is on a nave and two aisles divided by columns and piers. In the middle of the apse are two ruined frescoes, depicting St. Simplicius and Victor of Fausania, who was bishop of Olbia after 595 and is considered a saint only in this city. Under the altar are the relics of Simplicius, discovered in 1614 while excavating the church's crypt.References:
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.