Which major churches were built with Constantine I’s support?

Constantine I supported the construction of numerous churches throughout the Roman Empire to encourage the growth of Christianity. His patronage extended to major cities, including Rome, Constantinople, Trier, Nicomedia, Antioch, Gaza, Alexandria, and sites in the Holy Land.12

Key churches and projects supported by Constantine include:

• Rome: He began the construction of St. John Lateran around 313 and the original St. Peter’s Basilica in the late 320s, providing lavish endowments for the latter.32
• Constantinople: He commissioned the original Hagia Sophia (the Megale Ekklesia) and the Church of the Holy Apostles, the latter of which served as his burial place.132
• Jerusalem and Bethlehem: Following the discovery of the Holy Sepulchre, Constantine provided extensive resources for the construction of a great basilica at the site. He also supported church foundations in Bethlehem and at Mamre.2
• Other locations: His influence or direct support contributed to the development of churches in Trier, Aquileia, Cirta, and Antioch, where he also began an octagonal church.12