Janusz was not alone in abandoning the Polish side; many Polish nobles, such as Deputy Chancellor of the Crown Hieronim Radziejowski and Grand Treasurer of the Crown Bogusław Leszczyński, believing that John II Casimir was a weak king or a Jesuit-king, encouraged Charles Gustav to claim the Polish crown. John II Casimir had few friends among the Polish szlachta, as he openly sympathized with Austria and showed disregard and contempt for the Commonwealth. Poznań Voivode Krzysztof Opaliński surrendered Great Poland to Charles Gustav, and soon other voivodes followed.