Callisto was a nymph seduced by Jupiter when disguised as Diana. The scene comes from Ovid's Metamorphoses, book 2, lines 401-530 and especially 441-465, where the virgin huntress has just discovered her handmaiden's pregnancy and is banishing her. Callisto's child will be the forefather of the Arcadian people. Since ancient times Lake Nemi had been associated with the cult of the goddess. Virgil and other classical writers had described the smooth, rounded lake as the Speculum Dianae or Mirror of Diana and as such, it was frequently mentioned in 18th century guide-books. Her famous sanctuary, the Grove of Diana, was on the northern shore of the lake, beneath the little town of Nemi (in Latin, Nemus Aricinum). The classical connotations of the lake are here strengthened by the introduction of Diana herself, chastising the errant nymph.