Bath city walls the Romans, to surround their town (known then as "Aquae Sulis"), probably in the 3rd century. The Anglo-Saxons by the 10th century had established Bath as a fortified "burh" (borough), utilising the existing town walls, and maintaining Bath as a centre of regional power. Bath, located on the northern edge of the kingdom of Wessex, would have guarded against any attack from neighbouring Mercia, which was held by the Danes for a time. The height of the walls was increased on the orders of King Stephen during The Anarchy. Bath's medieval walls included four gates. The North and South Gates
Christianity in Roman Britain introduced Roman counterparts were venerated in the region, sometimes syncretising together, as in cases like Apollo-Cunomaglus and Sulis-Minerva. Romano-British temples were sometimes erected at locations that had earlier been cultic sites in the pre-Roman Iron Age. A new style of "Romano-Celtic temple" developed which was influenced by both Iron Age and imperial Roman architectural styles but also unique from both; buildings in this style remained in use until the fourth century. The cults of various eastern deities had also been introduced to Roman Britain, among them those of the deities Isis, Mithras, and Cybele; Christianity was just one of these