Guglielmo Aretini-Sillani
Guglielmo Aretini-Sillani was an Italian Roman Catholic bishop.
Ordained to the priesthood on 12 June 1813, Aretini-Sillani was named bishop of the Roman Catholic Diocese of Terracina, Priverno e Sezze, Italy in April 1835 and resigned on 4 December 1853.