Buuxi weedha soo socota: Sanadkii 1776, Tyszkiewicz wuxuu wakiil u ahaa Sejm oo ka yimid Vilnius Voivodeship. iyo 1778 waxaa loo sameeyay Mareeyaha Sejm. Sanadkii 1782, wuxuu taageero u ahaa Golaha Joogtada ah. Intii lagu guda jiray
Dagaalkii Polish-Russian ee 1792, kulankii 23-kii Luulyo, wuxuu taageeray ku biiritaanka boqorka ee Targowica Confederation, oo Tyszkiewicz laftiisu markiiba raacay, isagoo noqday Grand Marshal of Lithuania. Intii lagu guda jiray Sejm-ka Grodno, waxaa loo doortay inuu wada-hadal la yeesho danjiraha Ruushka Jacob Sievers, sidaas darteedna 22kii Luulyo 1793 wuxuu saxiixay heshiiskii ka-dhaafitaanka dhulka Ruushka, ka dibna 25kii Sebtember ee Prussia, oo qayb ka ah Qeybinta Labaad ee Poland. Sanadkii 1795, wuxuu ahaa hoggaamiyaha xisbiga Lithuania ee u hiilinaya Catherine II.