At the beginning of the 4th century, with the end of the persecutions and the promulgation of the Edicts of Tolerance in favour of Christianity, Emperor Constantine ordered the excavation of the cella memoriae, the place where Christians venerated the memory of Saint Paul the Apostle, beheaded under Nero around 65-67 A.D. Above his grave, located along the Ostiense Way, about two kilometers outside the Aurelian Walls surrounding Rome, Constantine built a Basilica which was consecrated by Pope Sylvester in 324.
Neat.
Does that basilica exist today? Is it St. Paul-Outside-the-Wall? With the chains? That was so moving.