Born in Warsaw on the 3rd of September, 1867. In his hometown he attended a secondary school and graduated from the Medical Faculty of the Imperial University. Following one-year’s employment in a clinic, he left for France, and took up studies at the Faculty of Diplomacy of the Paris Institute of Political Studies. Having returned to the Polish lands, Bartoszewicz – after a short sojourn in the Principality of Łowicz – commenced legal studies in Lviv, and afterwards found employment at the National Department of the Diet of the Kingdom of Galicia and Lodomeria. From 1904, he also administered the estates of Brykula and Czajka in Volhynia, which belonged to his wife’s family. In 1906 he settled down in Kyiv and, for many years, was a leading figure of Polish national life in that city. He was politically and ideologically involved in the activities of the National-Democratic movement. In 1906-1912 he was the editor-in-chief of ‘Dziennik Kijowski’, a daily associated with the National Democracy. During one of the meetings at Bartoszewicz’s place, which he organized as a commissioner of the National League, many of the participants were arrested by the tsarist authorities and the host himself was sentenced to three months in prison. In 1917 and 1918 Bartoszewicz headed the Polish Executive Committee in Ruthenia. In 1918-1919, as a member of the Polish National Committee, he involved himself in the reconstruction of the Polish state, serving, for instance, as the secretary of Polish deputation to the Versailles Peace Conference. In the Second Polish Republic he was a senator (1921-1937). In 1928 he became the chairman of the National Party (SN) and held that post until 1937. His works include Podręczny słownik polityczny (1922) and Zagadnienia polityki polskiej (1929). Bartoszewicz died on the 23rd of September, 1938.
