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-LRB- True Constancy -RRB- , Hob .. 28 / 8 , is an operatic dramma giocoso by Joseph Haydn .. Joseph Haydn. Joseph Haydn. dramma giocoso. dramma giocoso. The Italian libretto was a shortened version of the one by Francesco Puttini set by Pasquale Anfossi for the opera of the same name given in Rome in 1776 .. opera. opera. libretto. libretto. Pasquale Anfossi. Pasquale Anfossi. opera of the same name. La vera costanza ( Anfossi ). The story explores the troubles of a sentimental heroine abandoned by a mad lover .