St Albans is a city located in Hertfordshire, England. It was originally founded as Verlamion a settlement belonging to the Catuvellauni (a Celtic tribe or state of southeastern Britain before the Roman conquest, attested by inscriptions into the 4th century).It was subsequently transformed into the Roman settlement of Verulamium from where it grew into a municipium around AD 50. The city became known as St Albans around the 4th century AD with the martyrdom of St Alban who was buried close to the present day cathedral.