The church of San Donato;whose origins are unknown;rises two kilometers far from the town of Castelli;renowned for its ancient and precious tradition of ceramic art.The country-church;with a little porch on the front;probably meant to give hospitality to shepherds;was assigned to a Benedictine friar of the Orsini family;who had been lords of those lands for a long time.At the beginning of the XVI century he superintended the enlargement and the decoration of the church.He applied to the family Pompei;a dynasty of ceramic painters from Castelli and they handcrafted the majolica ceiling of the church;which was later removed and arranged on the ground before the altar.Nowadays the inside;consisting in a single room;is surmounted by roof trusses made up of seven hundred and eighty majolica tiles (re-arranged when the church was restored in 1968);carried out in the first half of the seventeenth century and representing for the most part secular subjects;especially human portrays;besides geometrical and floral patterns.A few of the ceramists who worked at the so called "Majolica Sistine Chapel" are known:Filippo and Giovanni di Francesco;renowned mainly for portrays and Stefano Cappelletti;who painted a big number of landscapes and animals.