LTReikšminiai žodžiai: Aleksandras, 1461-1506 (Aleksandras II, Aleksandras Jogailaitis, Alexander Jagiellon); Baltarusija (Belarus); Didikai ir magnatai; Lietuvos Didžioji Kunigaikštystė (LDK; Grand Duchy of Lithuania; GDL); Lietuvos istorija; Žemėvalda; Žygimantas Senasis (Sigismund the Old; Žygimantas II Senàsis, Zigmantas I Senàsis; Zygmunt I Stary); Grand Duke of Lithuania; History of Byelorussia; History of Lithuania; Landowing; Nobility.
ENPractical activity of the grand dukes of Lithuania Alexander Kazimirovic and Sigismunt Kazimirovic in the administrative, economic and legal spheres and its conformity to state legal standards are considered in the article. The author comes to the conclusion that at the times of the named monarchs’ ruling the power of grand dukes was very weak and it didn’t correspond not only to declarative but to officially definite, limited condition. [text from author]