Mausoleo di Santa Costanza, Rome

Built in the 340s CE as a mausoleum for Constantine's daughter Constantina, near the tomb of Saint Agnes. Converted to a church in the 13th century. The 4th-century mosaics preserve the transition from pagan to Christian art.

Constantina, daughter of Emperor Constantine I, was devoted to Saint Agnes, the young Roman martyr whose tomb lay on the Via Nomentana. She built her mausoleum here to be near the saint she venerated. The building followed Roman imperial mausoleum traditions—circular plan, domed space, burial in a magnificent sarcophagus—while incorporating Christian elements. The mosaics that cover the ambulatory vault use imagery that could be read as either pagan (Bacchic harvest scenes) or Christian (Eucharistic symbolism). Whether the ambiguity was intentional or simply reflected the artistic vocabulary available in the 340s, the result documents Christianity's emergence from Roman visual culture.