 Other important patrons of Polish culture included the Roman Catholic Church and Polish aristocrats , who likewise supported artists and safeguarded Polish heritage ( notable patrons included Cardinal Adam Stefan Sapieha and a former politician , Janusz Radziwiłł ) . Some private publishers , including Stefan Kamieński , Zbigniew Mitzner and the Ossolineum publishing house , paid writers for books that would be delivered after the war . 
