A convent on the island of Bisentina in the Lake of Bolsena, Italy.
John Evelyn describes the convent as:
”we descended toward the Lake of Bolsena, which being above twenty miles in circuit, yields from hence a most incomparable prospect. Near the middle of it are two small islands, in one of which is a convent of melancholy Capuchins, where those of the Farnesian family are interred. Pliny calls it Tarquiniensis Lacus, and talks of divers floating islands about it, but they did not appear to us”