Four drawings with uncertain or erroneous attributions are presented here with their correct authorship. These consist of a study by the Flemish painter Pieter de Witt (Pietro Candido), preparatory for the "Adoration of the Shepherds" painted during his Tuscan period; a drawing — the first one proposed thus far — by the Roman Girolamo Nanni for the "Allegory of Promptness" frescoed in the apartment of Paul V Borghese in the Vatican; a double sheet by the Marchigian Filippo Bellini connected to his last work, the "Last Supper" in Macerata Cathedral; and a study by Pietro da Cortona’s follower Giuseppe Nicola Nasini (until now classified as the work of a Roman late Mannerist) for the "Council of Nicea and the Condemnation of the Arian Theses" frescoed in the Oratorio della Santissima Trinità in Siena in 1696.