Graal and Müritz were two separate places until 1938. The older eastern part of Müritz was first mentioned in 1328. It is located behind today's Tannenhof children's sanatorium. The name of the place derives from the Wendish name muryz (= place by the sea), the name for the piece of land in the Rostock Heath, which Prince Henry the Lion gave to the monastery of St. Claren in Ribnitz in 1328.
The origins of the western part of Graal lie in a courtyard from 1525 (later the princely Meierhof) around which the village was formed. The name is probably derived from the Slavic locator grail, i.e. place of the grail. The place Graal is documented for the first time in 1567 in the customs files of the nearby Hanseatic city of Rostock.
-wikipedia-