Sandro Botticelli - Nastagio degli Onesti Nastagio degli Onesti is the protagonist in one of the one hundred short stories contained in The Decameron by Giovanni Boccaccio. The eighth story of the fifth day, it tells of the unrequited love of the nobleman Nastagio for a girl who will eventually be induced to accept Nastagio’s affection by the appearance of a rejected lover and her beloved.