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
Celsa (Roman city) the "scaenae frons" (stage) walls and tiers of seats ("cavea") have been found. Many small objects as lamps, Pompeian red slip dishes, Iberian ceramics, etc., as well as small bronzes, sculptural remains, coins and small pieces of jewellery are also preserved. A nearby museum displays many of the finds. Celsa (Roman city) Celsa was an important pre-Roman and Roman city located near the modern town of Velilla de Ebro. Recent excavations have brought to light many rich private and public buildings which give a glimpse of its former grandeur. Celsa was originally an Iberian settlement, called "Kelse", of the Ilergetes