9 4th century establishments in the Roman Empire

Ad Plumbaria was a civitas (town) of the Roman North Africa The town flourished from AD 300-AD 640.

The Aqueduct of Valens was a Roman aqueduct system supplying Constantinople, the capital of the Eastern Roman empire. Completed by Roman Emperor Valens in the late 4th century AD, the Aqueduct of Valens was in use for many centuries, extended and maintained by the Byzantines and the Ottomans.

The Arch of Malborghetto is an Ancient Roman quadrifrons arch located nineteen kilometres north of Rome on the via Flaminia. Today, because of reuse over the centuries, it is part of a mass of construction which appears to be a Medieval structure at first sight. Nevertheless, the core of the structure is datable to the first half of the fourth century. The original marble coating has been completely lost.

In Late Antiquity, a consular diptych was a type of diptych intended as a de-luxe commemorative object. The diptychs were generally in ivory, wood or metal and decorated with rich relief sculpture. A consular diptych was commissioned by a consul ordinarius to mark his entry to that post, and was distributed as a commemorative reward to those who had supported his candidature or might support him in future.

The Diocese of Pannonia, from 395 known as the Diocese of Illyricum, was a diocese of the Late Roman Empire. The seat of the vicarius was Sirmium.

Euphratensis, fully Augusta Euphratensis, was a late Roman and then Byzantine province in Syrian region, part of the Byzantine Diocese of the East.

Mamre, full Hebrew name Elonei Mamre, refers to an ancient cultic shrine originally focused on a single holy tree, growing since time immemorial at Hebron in Canaan. Talmudic sources refer to the site as Beth Ilanim or Botnah, where it was one of the three most important "fairs", or market places, in Judea. Mamre lies approximately halfway between Halhul and historical Hebron, 4 kilometres north of the latter.

The Convent of Saint Thecla is a Greek Orthodox convent in Maaloula, Syria. It is administered by the Greek Orthodox Patriarchate of Antioch. The convent was built in 1935 around the grotto of St. Thecla.

The Diocese of Toul was a Roman Catholic diocese seated at Toul in present-day France. It existed from 365 until 1824. From 1048 until 1552, it was also a state of the Holy Roman Empire.