Occurrence of Attributes in Original Text

The text related to the cultural heritage 'City of Graz – Historic Centre and Schloss Eggenberg' has mentioned 'Valley' in the following places:
Occurrence Sentence Text Source
With a strategic location at the head of the open and fertile Mur valley, Graz was historically a target of invaders, such as the Hungarians under Matthias Corvinus in 1481, and the Ottoman Turks in 1529 and 1532.