In the sixth century, the ancient monastery was the seat of the catholic bishops of Tui during the political-religious conflicts with the arian christians. During the eleventh century, the bishops made Tui their home following the restoration of their religious seat in 1067. The church retains pre-roman ornamental features including scenes in the radiating apsidal chapels of the beheading of John the Baptist at the feast, along with scenes depicting the punishment of those who refused to recognize the prophet Daniel. The main chapel retains murals of the Crucifixion of Christ painted at the end of the sixteenth century by the Serveira workshop.

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Elevation of the church
Excavations