Coal of a permanent brazier of coal on the altar of Minerva at Aquae Sulis (modern day Bath), although in fact easily accessible surface coal from what became the Somerset coalfield was in common use in quite lowly dwellings locally. Evidence of coal's use for iron-working in the city during the Roman period has been found. In Eschweiler, Rhineland, deposits of bituminous coal were used by the Romans for the smelting of iron ore. No evidence exists of the product being of great importance in Britain before about AD 1000, the High Middle Ages. Mineral coal came to be referred to
Roman Dacia towns". Therefore, categorizing sites as small towns has largely focused on identifying sites that had some evidence of industry and trade, and not simply a basic agricultural economic unit that would almost exclusively produce goods for its own existence. Additional settlements along the principal route within Roman Dacia are mentioned in the "Tabula Peutingeriana". These include Brucla, Blandiana, Germisara, Petris, and Aquae. Both Germisara and Aquae were sites where natural thermal springs were accessible, and each are still functioning today. The locations of Brucla, Blandiana, and Petris are not known for certain. In the case of Petris however, there is