Clarus Mons, Medieval castle in Clermont-Ferrand, France.
The castle stood on a prominent hilltop where the current city hall of Clermont-Ferrand now sits, built from light-colored arkose stone that reflected sunlight.
First mentioned in 422 during the consulate of Theodosius and Honorius, the fortress protected the city of Arvernis, which later became known as Clermont-Ferrand.
The castle appeared in Guillaume Revel's Armorial d'Auvergne around 1450, providing detailed documentation of medieval architecture and military structures in the region.
The strategic location of the castle protected three main city gates: the Boucherie gate, the Palais gate, and the Barnier gate.
The name Clarus Mons, meaning clear mountain in Latin, derived from the light-colored arkose stone used in construction, making it visible from great distances.
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