Jasienica book publishing begun with a historical book, "Zygmunt August na ziemiach dawnego Wielkiego Księstwa" (Sigismund Augustus in the lands of the former Grand Duchy; 1935). He is best known for his highly acclaimed and popular historical books from the 1960s about Piast Poland, Jagiellon Poland and the Polish–Lithuanian Commonwealth: "Polska Piastów" (Piast Poland, 1960), "Polska Jagiellonów" (Jagiellon Poland, 1963) and the trilogy "Rzeczpospolita Obojga Narodów" (The Commonwealth of Both Nations, 1967–1972). This trilogy made him one of the most popular Polish history writers. Throughout his life he avoided writing about modern history, to minimize the influence that the official, communist Marxist historiography would have on his works. This was also one of the reasons for the popularity of his works, which were seen as a rare, legally obtainable alternative to the official version of history. His books, publication of which resumed once again after his death, were labeled as "best-selling", and became the most reprinted postwar history of Poland.