The keep of a castle is mentioned in Domesday Book, the ruins of which, now limited to a solitary bastion on the river's side, were very extensive, even in Leland's time (1506-1552). Caerleon was a place of great ecclesiastical importance and the seat of an archbishopric. It is noticeable as the place of martyrdom, according to Giraldus Cambrensis, of two saints, Aaron and Julius. Their bodies were buried in the city, each afterwards having a church dedicated to him. There is good reason for regarding these as historical personages, but as Caerleon-upon-Dee was also called "the City of the Legions," there is some doubt whether their martyrdom occurred at the former, now called Chester, or at the latter, which still retains its British name.
Around the church of S. Cadoc there are abundant remains to show the important centre Caerleon-upon-Usk constituted in Roman times. There is a tradition that its bishop was one of three who attended the Council held at Arles, in 314, to discuss the validity of ecclesiastical orders conferred by such bishops as in time of persecution had delivered up to be burnt their sacred writings.
CAERWENT.—This place is on the Chepstow side of Caerleon, near Severn Tunnel Junction.
It was a military station, and important discoveries of Roman remains have been made here.
CAISTOR CASTLE, or VENTA.—4½ miles from Yarmouth. Caistor Village is 3 miles distant.
This place occupies the site of a Roman camp, which, in conjunction with Burgh Castle, guarded this part of the coast. No remains of the camp now exist, but Roman urns, pottery, and coins have been found in and near the village. A field west of the church, styled "East Bloody Furlong" has been fixed upon as the site of the Castrum.
CANTERBURY.—Cant-wara-byrig—the burgh of the men of the headland. (Hence, Archepiscopus Cantuariensis).