ENThe article discusses a dispute that took place in the Grand Duchy of Lithuania in the 1770s when the king granted Casimir Wolmer privileges to a large fiefdom (feudal estate) of Vėžaičiai in Samogitia. The problem was that at the time the estate was in the hands of the Oginski family, and C. Wolmer had set out to prove that they were not the legal owners. Status of a fiefdom for this estate was granted in 1598 by the king of the Polish-Lithuanian Commonwealth Sigismund III Vasa, allowing it to be inherited by a male offspring of Tatar Temruk Szymkowicz who became distinguished in military campaigns. Later on the estate was passed on to the Maydl family and, with the death of the last male descendant, on 8 August 1750 privileges to this fief went to Court Marshal of the Grand Duchy of Lithuania Ignacy Ogiński. However, the privilege said that the fief was supposed to belong to the family until the death of last male descendant in the entire family and not a single line. This, according to C. Wolmer, was illegal, because such provisions after the Union of Lublin and the Pacta conventa could only be made by the Sejm. Initially the dispute was investigated by the special commission and later by the Supreme Tribunal of the Grand Duchy of Lithuania. After the Ogiński family lost the case, Hetman of the Grand Duchy of Lithuania Michał Kazimierz Ogiński appealed to the Permanent Council asking to suspend execution of the court's decision and to initiate trial of the Tribunal's judges in the court of Sejm. Although in the course of this case the Tribunal did violate some laws, its decision remained in power. In this case not only legal aspects were important, but also the fact that C. Wolmer belonged to the Court faction whereas Ogiński was in opposition. [From the publication]