Pomerania during the Early Modern Age covers the history of Pomerania in the 16th, 17th, and 18th centuries. The name Pomerania comes from Slavic po more, which means "[land] by the sea". The Duchy of Pomerania was fragmented into Pomerania-Stettin (Farther Pomerania) and Pomerania-Wolgast (Western Pomerania) in 1532, underwent Protestant Reformation in 1534, and was even further fragmented in 1569. In 1627, the Thirty Years' War reached the duchy. Since the Treaty of Stettin (1630), it was under Swedish control. During the war, the last duke Bogislaw XIV died without an issue. Garrison, plunder, numerous battles, famine and diseases left two thirds of the population dead and most of the country ravaged. In the Peace of Westphalia of 1648, the Swedish Empire and Brandenburg-Prussia agreed