The Prussian Crusade is a series of thirteenth-century campaigns of Roman Catholic crusaders, primarily led by the Teutonic Knights, to Christianize the pagan Old Prussians.
Invited after earlier unsuccessful expeditions against the Prussians by Polish princes, the Teutonic Knights begin campaigning against the Balts in 1230.
By the end of the century, having quelled several Prussian Uprisings, the Knights have established control over Prussia and administered the Prussians through their monastic state.
