In the western part of Roman Poetoviona, in today's Spodnja Hajdina, the oldest Mithras shrine in the provinces of the Upper Danube was discovered by Wilhelm Gurlitt, an archaeologist from Graz, Austria, between 1898 and 1899. The shrine was immediately after having been unearthed covered by a protective house. Dedications show that the shrine was built in the middle of the 2nd century by administrators of the Illyrian customs based in Poetoviona. The shrine was partly dug into a gentle slope and covered by interwoven branches of a willow.