The monograph “Reformation in Poland and the legacy of Erasmus of Rotterdam” is an innovative contribution to the research on the history of Poland in the 16th century. The work refers to the pre-war studies of the fathers of Polish historiography (such as Wincenty Zakrzewski or Stanisław Kot), and at the same time fills the gap in the latest research on the history of the Reformation and theological and political thought. The central problem of work – the formation of attitudes towards the Reformation among the political and intellectual elites of the Kingdom of Poland – is one of the fundamental scientific problems of 16th century historiography. Thanks to a broad source query as well as a comparative perspective, broadly taking into account the European context of events, the work proposed a new perspective on the history of modern Poland. It also showed the new meaning of the so-called “Polish tolerance”.