Rein Monastery - Cistercian monastery, located near Gratvayna in the Austrian federal state of Styria. The monastery is also known as "the cradle of Styria."

The monastery was founded in 1129 by Leopold strongest of Styria, the monks moved here from the abbey Ebrach (Bavaria) under the leadership of the abbot Gerlakusa. At that time, it was the 38th Cistercian monastery, however, the previous 37 did not survive and this means that the Rhine - the oldest preserved Cistercian monastery.

In September 1276 the noble citizens of Styria and Carinthia entered into an alliance with King Rudolf I against the reigning King Ottokar II, stoked thereby securing Habsburg as rulers of Austria.

In the 15th century the monastery was at its peak. However, in 1480 after the Turkish invasion, the monastery was badly damaged. Damages were eliminated in subsequent years, built fortifications with ramparts and towers. In the same year, an outbreak of the plague, which fell victim to the abbot Ganser (1472-1480).

In the early 17th century there was a need to expand the monastery buildings. Changes were made in the years 1629-1632 by the architect Bartholomew de Bosio. The restoration of the church in the Baroque style made the years 1738-1747 Johann Georg Stengom Graz. The frescoes, which appeared in 1766, were executed by Josef Adam von Malcom and zaaltarnaya Katina - Martin Johann Schmidt in 1779.

Abbey Library, which consists of 100,000 books contains 390 unique manuscripts.

During the Second World War, the abbey was confiscated by the Nazis, and the monks expelled. Back they were able in the end of 1945. Currently the abbey has 10 monks and abbot Shtaygenberga Petrus (56th abbot of the monastery since its inception).