4th century in architecture

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Events

313 – Emperor Constantine issues the Edict of Milan, legislating toleration of Christian worship in the Roman Empire. The 4th century sees the construction of many churches, especially in Rome (see below), and in the eastern empire.

Early – Church of St. George, Sofia (Serdica) is probably completed.
303 – Arch of Galerius in Thessaloniki (Macedonia) is dedicated.
306 – Rotunda of Galerius in Thessaloniki is built.
c.310 – Aula Palatina (Basilica of Constantine) at Trier is built.
312–315 – Arch of Constantine in Rome is built.
c.326–380 – Church of the Holy Sepulchre in Jerusalem (including Anastasis Rotunda).
368 – Valens Aqueduct in Constantinople is completed.
From 382 – San Nazaro in Brolo (Basilica Apostolorum) in Milan is begun by Ambrose.
386 – Basilica of Sant'Ambrogio (Basilica Martyrum) in Milan, built by Ambrose, is consecrated.
c.390s – Kasagh Basilica in Armenia is built.
393 – The Forum of Theodosius in Constantinople, reconstructed over the Forum Tauri, is inaugurated.
Dadhimati Mata Temple in Rajasthan is built.

Tuck, Steven L. (27 January 2015). A History of Roman Art. John Wiley & Sons. p. 313. ISBN 978-1-4443-3026-7.
Anderson, Zachary (2015). The Fall of Rome and the Rise of Constantinople. Cavendish Square Publishing, LLC. p. 48. ISBN 978-1-5026-0575-7.