Sulis

A town just south of Môr Hafren, on the River Avon. Known for its natural springs and baths, also named Bath. It is a walled town with defensive stone structures, also referred to as borough walls. 
Sulis was a Roman town at the mouth of the river later named after its Roman-built baths, and known as Aquae Sulis, for "the waters of Sulis"; once the shrine of Celtic Britons on a large natural hot spring, and dedicated to Sulis: goddess of healing, water, hot springs and curses. The Romans identified the goddess with Minerva, and encouraged her worship. The spring was built up into a major Roman Baths complex associated with an adjoining temple. 
Also: Aquae Solis