CIMRM Supplement - Mithraeum. Kempraten, Switzerland.
A Mithraeum was discovered in 2015 during rescue archaeology at Zürcherstrasse 131, Kempraten, overlooking lake Zurich. The location was in the vicus of the Roman settlement. Coins from the 3rd century AD were found, and also some as late as Valentinian and Theodosius, suggesting that it ceased to function at the end of the 4th century. An complete steatite altar was found, dedicated to "Invicto Mitre", and right next to a large cult image. Other dedications to "Invicto" or "Deo invicto" were also found. A weathered large sandstone altar dedicated to Invictus with the top 3-4 lines preserved was found.
Bones of poultry and pig were discovered. Also more than 50 rock crystal fragments and hundreds of crystal chips were recovered from the central aisle. Only 1 other Mithraeum had such a feature: that at Martigny where crystals were attached to the ceiling to symbolise the stars, reflected from the lamps below. The ritual cave at Zillis also had crystals.1
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From an article by Hans Jakob Becker, 28th August 2015.2
The site was presented to visitors by the Canton archaeologists Martin Schindler and Regula Ackermann. The excavation director is Hannes Fluck, and trainee archaeologist Sarah Lo Russo showed them around. The kilns were 6m high, and the stone came across the lake.
An exhibition of finds is scheduled for November.
Update: a new article in 1815.ch, "Heiligtum des Mithras-Kults in Kempraten SG entdeckt", 10 March 2016. "The Mithraeum, used in the 3-4th c. AD and now rediscovered, was a rectangular building with mortared foundation walls and a wooden superstructure, with a shingled roof. It stood away from the village, directly on the lake-side. ... Numerous ceramic and soapstone fragments have been found, which originate from use in cult banquets. Animal bones discovered show that poultry especially was eaten. Further evidence of the cult found are rock crystals, boar tusks, clay balls, and many coins. The stone altar fragments are inscribed, and there is part of a sandstone cult image of a larger-than-life Mithras. The finds will now be cleaned, labelled, inventoried, and carefully packaged. The goal is a scholarly evaluation and publication."