Originally Posted by
disciple
"The New Testament speaks of a large church in Jerusalem meeting together in a public space (e.g., the outer court of the temple in Acts 2:46) and in smaller groups in houses (e.g., the house of Mary, mother of Mark, in Acts 12:12). This practice must have been carried on in many cities of the Roman empire. For the most part, the church was dependent on members or supporters (patrons) who owned larger houses, providing a place for meeting. In Rome, there are indications that early Christians met in other public spaces such as warehouses or apartment buildings. Before Emperor Constantine recognized Christianity as a legal religion in 313, corporate ownership of property by the church could be legally ambiguous. Unless claims for recent discoveries of early Christian meeting places are confirmed, the earliest building certainly devoted to Christian use is at Dura Europos on the Euphrates River in eastern Roman Syria. It was a house that came into Christian possession and was remodeled in the 240s. Two rooms were combined to form the ***embly room, and another room became a baptistery—the only room decorated with pictures. Dura was destroyed by the S***anian Persians in 256, so the house's use as a church was short-lived.
The church's house at Dura represents an intermediate stage between meeting in members' houses or other suitable places, and constructing buildings specifically for church meetings. There are literary references to separate church buildings from the end of the second century and through the third century, but it is uncertain whether these were existing structures remodeled for church use, like the house at Dura, or new constructions. We have archaeological evidence of halls being built for church meetings at the end of the third and beginning of the fourth century. The great era of church buildings began with Constantine's patronage of the church in the fourth century. He commissioned basilicas to signal his support of the new religion and to advertise his reign."
Copied from Christian History written by Everett Ferguson