In 2018, there are significant anniversaries for the history of statehood and the Polish nation. Apart from celebrating the centenary of independence (11 November 1918), the 550th anniversary of the bicameral Polish parliament is also celebrated. The impetus for this second anniversary is the result of a study by professor Wacław Uruszczak, who proved that as early as 1468 the principle of deputies’ representation functioned: each ‘land’ (ziemia) sent two deputies to the Sejm. These studies were published in the memorial book of Janusz Kurtyka (The oldest bicameral parliament in Piotrków in 1468 [in:] The Birth of the Polish Republic. Studies on the History of the Middle Ages and Early Modern Times, ed. W. Bukowski, T. Jurek, vol. II, “Societas Vistulana”, Kraków 2012, pp. 1033–1056) During the session, 12 papers were presented by researchers from Poland, Lithuania, Belarus, Ukraine, and Hungary.