1321 inheritance agreement (Erbverbr�derung), and from 1368/72-1451 was part of the estate of a branch line, the House of Barth. This state of affairs, together with the disputes over the Danish throne that occurred at that time, led to the R�gen wars of succession. After they had played out, the former principality went in 1354 to Pomerania-Wolgast and thus became part of the Holy Roman Empire. In 1478, Pomerania-Wolgast and Pomerania-Stettin were united and, 170 years later, the combined state went to Sweden in 1648 as a result of the Treaty of Westphalia (see Swedish Pomerania). R�gen was part of Swedish Pomerania from 1648 to 1815. Under Gustav IV Adolf of Sweden the town of Gustavia was constructed on the M�nchgut peninsula, but was abandoned during the Napoleonic Wars. In the years 1678 and 1715, R�gen was briefly wrested from the Swedes by the Elector of Brandenburg, Frederick William and by the King in Prussia, Frederick William I. For example, a Brandenburg-Danish army landed on the island as part of the invasion of R�gen in 1678. After the Treaty of Saint-Germain in 1679 the island passed from Danish to Swedish ownership again. At the time of Napoleonic Wars, R�gen was held held by the French from 1807-1813. In the Treaty of Kiel of 1814, it was transferred initially from Sweden to Denmark and then fell to Prussia, along with New Western Pomerania (Neuvorpommern), thanks to the Vienna Convention of 1815. In 1818 the island became part of the administrative district of Stralsund and thus belonged to the Prussian Province of Pomerania.
In 1816 the first bathing resort was founded at Putbus. Later more resorts were established, and R�gen remained the most famous holiday resort of Germany until World War II.
The Nazis added a large resort: Prora, planned by the Strength Through Joy organisation, which aimed to occupy people's free time. However, Prora was never completed.
In 1936 the first bridge connecting R�gen with the mainland was
