The Abbey of the Holy Trinity was built in 1081 by Roger I of Hauteville in Mileto, a city that had been chosen by the Grand Count as the capital of his county. The building was unfortunately destroyed by a violent earthquake in 1783. At present, there are only a few ruins and finds which have been brought to light by Paolo Orsi’s archaeological excavations, carried out between 1916 and 1923, and other more recent interventions.
