Claim: The opera "Maria" by Polish composer Roman Statkowski (a Saint Petersburg Conservatory graduate) was performed in various Polish cities between 1919 and 1965.
Evidence: Statkowski's two operas were Philaenis (or Filenis) (1897, first performed in 1904) and Maria (1903-4, first performed in 1906). The latter is based on a novel of the same name by Antoni Malczewski. It has achieved some popularity in its native country and has been performed in various Polish cities between 1919 and 1965. When he deserted the law for a musical career, he studied with Władysław Żeleński in Warsaw and then at the Saint Petersburg Conservatory with Nikolai Soloviev and Anton Rubinstein, graduating at the age of 31 in 1890.