Location: Sofia
Site type: Religious
Period of construction: 4th century
The oldest and best-preserved monument of architecture since Roman times in Sofia is the rotunda church St. George. It was built at the beginning of the 4th century AD during the reign of the Roman emperor Constantine the Great (reigned 306 – 337) and the flourishing of the ancient town Serdika (the old name of Sofia). It is believed that the rotunda is the oldest building in Sofia.