The relics of the Roman town of Aquincum, founded in the 1st C AD on the west bank of the Danube - now on Szentendrei utca - have been methodically excavated since the 1870s. A substantial part of the former "municipium" is now easily reached as an open-air museum. About the year 10 BC the Romans occupied the region of their later province of Pannonia. A few years after the birth of Christ they constructed within the boundaries of Óbuda a military camp, around which a civil township soon grew. The prosperous settlement of Aquincum became, as early as the beginning of the 2nd C., the principal township of the province of Pannonia Inferior. The Emperor Septimus Severus raised it to the grade of a "colonia" in AD 194.