ENThe formation of national states and spread of nationalism at the beginning of the first half of the 20th century receded memory about common Polish-Lithuanian history. The dispute on the shape of Lithuania bore the idea of reconstruction of multicultural Lithuanian state. The article describes memory of multicultural tradition of the Grand Duchy of Lithuania and the will to improve Polish-Lithuanian relations and mutual understanding, which the Krajowcy activists promoted. Keywords: Grand Duchy of Lithuania, Krajowcy, Lithuanian-Polish Relations, Multicultural Tradition, Vilnius.