The Augusta Traiana – Vereia Archaeological Preserve in Bulgaria’s Stara Zagora features the remains of the Ancient Roman city of Ulpia Augusta Traiana founded by Roman Emperor Trajan (r. 98-117 AD) (after whom it was named) on the site of a previously existing Ancient Thracian settlement called Beroe. It saw its greatest urban development later under Roman Emperor Marcus Aurelius (r. 161-180 AD).
In the late Antiquity (4th-6th century) the city of Augusta Traiana was once again known under its original Thracian name of Beroe. Much of it was destroyed by barbarian invasions – by the Goths in the 4th century, the Huns in the 5th century, and later by the Avars, Slavs, and Bulgars. The invasions of the Bulgars and Slavs in the late 7th century, around the time of the two peoples formed the First Bulgarian Empire (680-1018 AD), effectively ended the life of the Ancient Thracian and Roman city of Beroe / Augustra Traiana as it was.
It became part of Bulgaria under Khan Tervel (r. 700-718 AD), who called it Boruy. The city was a major bone of contention during the numerous wars between Bulgaria and Byzantium and became known as Vereia after Byzantium conquered the eastern parts of the First Bulgarian Empire in the late 10th century. Bulgaria reconquered it during the early years of the Second Bulgarian Empire (1185-1396 AD). In addition to its Neolithic, Ancient Roman, Byzantine, and medieval Bulgarian heritage, the territory of the city of Stara Zagora is dotted with Ancient Thracian archaeological sites, including more than 30 known temples of the main god according to Thracian mythology, the Thracian Horseman.