LTReikšminiai žodžiai: Lietuvos Didžioji Kunigaikštystė (LDK; Grand Duchy of Lithuania; GDL); Abiejų Tautų Respublika (ATR; Rzeczpospolita Obojga Narodów; Žečpospolita; Sandrauga; Polish-Lithuanian Commonwealth); Maskvos valstybė (Maskvos Didžioji Kunigaikštystė; Muscovite state; Grand Duchy of Moscow); Žemėvalda; Teisėkūra; Brastos bažnytinė unija; Užsienio politika; Etmono pareigos; Kancleris; Vaivada; The Grand Duchy of Lithuania; The Grand Duchy of Moscow; Landownership; Creation of the law system; Church union of the Brest; Foreign affairs politics; Duties of hetman; Chancellor; Voivode.
ENThis monograph is dedicated to Lew Sapieha, one of the most prominent politicians of the so-called Old Polish Era that lasted from the fourteenth century until the seventeenth century. He was born on 4 April 1557 in Ostrovno, Belarus, as the son of Iwan Sapieha, Vice-Starost of Orsha, and Bohdana, a descendant of aristocratic families of Druccy- -Sokolińscy. Sapieha died on 7 July 1633. His political career developed rapidly thanks to his close cooperation with successive Polish kings - Stephen Bathory and Sigismund III Vasa. Within a few years he significantly moved up the official ranks. He became Great Secretary of the Grand Duchy of Lithuania in 1580, Great Clerk of the Grand Duchy in 1581 and Vice-Chancellor of the Grand Duchy in 1585. In 1589 he became Chancellor of the Grand Duchy. However, the biggest achievement of his career was promotion to the rank of Voivode of Vilnius in 1613 and Great Lithuanian Hetman in 1625. Within one generation he managed to establish the long-term power and wealth of the Sapieha family. [...]. [From the publication]