During the Reformation, Louis the Pacific ruled the Palatinate until 1544 and strove for reconciliation. His 1538 religion edict allowed Lutherans to preach and take communion. Equally even-handed was his brother and successor, Frederick the Wise. Not until his successor were there strict Protestant rulers. When Frederick III died in 1576, he left a clause in his will that his Lutheran son, Louis VI should not inherit the "Ämter" of Kaiserslautern and Neustadt, but that they should go instead to his Calvinist brother, John Casimir.