Santa Maria in Trastevere, central nave & apse.
Basilica of Saint Mary in Trastevere
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dedication: Mary mother of Christ
built: c.340ad
major restorations: 1143
relics: remains of Pope St. Calixstus
orientation: east (equinox)
The Basilica
Although the floor plan, and perhaps parts of the structure, date to the early fourth century, the church was practically rebuilt in 1143. The present form has much in common with Santa Maria Maggiore, and seems to have been modelled on that church.