Frederick the Great of Prussia nourished a particular hatred and contempt for the Polish people. Following his conquest of Poland, he compared the Poles to "Iroquois" of Canada. In his all-encompassing anti-Polish campaign, even the nobility of Polish background living in Prussia were obliged to pay higher taxes than those of German heritage. Polish monasteries were viewed as "lairs of idleness" and their property often seized by Prussian authorities. The prevalent Catholicism among Poles was stigmatised. The Polish language was persecuted at all levels.