بروسيا الملكية
In Royal Prussia, 41% of the parishes were counted as Lutheran in the second half of the 16th century, but that percentage kept increasing. According to Kasper Cichocki, who wrote in the early 17th century, only remnants of Catholicism were left there in his time. Lutheranism was strongly dominant in Royal Prussia throughout the 17th century, with the exception of Warmia (Ermland).