Britannica Sources used in this answer

How did Christianity become able to build larger and more public churches after the Edict of Milan?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

James Paine and Robert Adam: Kedleston Hall — Western architecture Kedleston Hall, Derbyshire, England; designed by James Paine and Robert Adam.

Following the Edict of Milan in 313 CE, Christianity transitioned from a persecuted minority to a religion under imperial protection and patronage, which enabled the construction of large, public churches.12

Rather than creating an entirely new architectural style, architects adapted the basilica—a secular Roman building type used for lawmaking, commerce, and assembly—to serve the needs of the Christian liturgy. These structures provided the necessary scale and interior space for large gatherings, featuring a central nave flanked by side aisles and terminating in an apse.34

Emperor Constantine I was instrumental in this shift, funding the construction of monumental churches such as St. Peter’s Basilica and the Basilica of St. John Lateran in Rome. By adopting the basilica form, Christians gained access to a proven, utilitarian design that could accommodate the growing number of the faithful while reflecting the grandeur of the imperial state.513