House of Nassau
After the Catholic counts of the House of Nassau-Saarbrücken, ruling the County of Saarwerden, became extinct in the male line in 1574, the Lutheran House of Nassau-Weilburg inherited the county and Philip IV, Count of Nassau-Weilburg introduced the Reformation there. The territory of the former county in the environs of Sarrewerden still shows a high Lutheran share among the overall population.