sentences:  Later he studied history under Mykhailo Hrushevsky at Lviv University.He wrote his 1911 doctorate on "The Cossacks and Bathory's Privileges," a study of the origins of the Ukrainian Cossacks legally registered with the Polish government.From 1908 to 1914, he published extensively in Galician Ukrainian journals and magazines and took part in the "Prosvita", or "Enlightenment" movement geared to raise the educational level of the Galician Ukrainian peasantry.