The church of San Magno was built from tuff in the fifteenth century in Gradoli on the banks of Lake Bolsena.
It was erected under the Order of the Knights of Malta that sold it to the City in 1908.
On August 19 of each year, there is Mass with the rite of the "forgiveness of S. Magno".
It is a plenary indulgence granted the first time in 1611 by Pope Paul V Borghese and renewed by Pope Benedict XIV in 1774.
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