During Khmelnytsky Uprising he was one of the most prominent members of the negotiations and pro-Cossack factions among the szlachta. In the very beginning of the Uprising he sent a Russian Orthodox monk, Petroni Łaska, to try to calm down the Cossacks and begin negotiations. The Sejm resolution of 22 July 1648 chose him, Aleksander Sielski, podkomorzy poznański, Franicszek Dubrawski, podkomorzy przemyski and Teodor Obuchowicz, podkomorzy mozyrski, to negotiate with Khmelnytsky. The negotiations ended in failure by February 1649.