The Polish–Lithuanian Commonwealth was marked by high levels of ethnic diversity and by relative religious tolerance, guaranteed by the Warsaw Confederation Act 1573; however, the degree of religious freedom varied over time.
Den polsk-litauiske Realunion var kendetegnet ved en høj grad af etnisk mangfoldighed og relativ religiøs tolerance garanteret af Warszawa konføderationen fra 1573, selv om graden af religiøs tolerance varierede over tid.