Which British city was once a Roman spa town?

Bath is a city and unparished area in the Bath and North East Somerset unitary area in the ceremonial county of Somerset, England, known for and named after its Roman-built baths. At the 2021 Census, the population was 101,557. Bath is in the valley of the River Avon, 97 miles (156 km) west of London and 11 miles (18 km) southeast of Bristol.

The city became a World Heritage Site in 1987, and was later added to the transnational World Heritage Site known as the "Great Spa Towns of Europe" in 2021. Bath is also the largest city and settlement in Somerset.

The city became a spa with the Latin name Aquae Sulis ("the waters of Sulis") c. 60 AD when the Romans built baths and a temple in the valley of the River Avon, although hot springs were known even before then.