"Santo Stefano in Manciano is a medieval abbey, long abandoned, at Manciano (frazione of Trevi)) in Umbria, Italy. Now only the beautiful ruined church, dating at the latest to the first half of the 13th century, remains."@en . . . "Santo Stefano in Manciano"@en . . "Santo Stefano in Manciano is a medieval abbey, long abandoned, at Manciano (frazione of Trevi)) in Umbria, Italy. Now only the beautiful ruined church, dating at the latest to the first half of the 13th century, remains."@en . . . .