Denarius

Obverse

Obverse legend

Reverse legend

Reverse

KAROLVS - IMP AVG (laureate and draped bust of Charlemagne to the right. The letter C under the bust).

XPICTIANA RELIGIO (circular legend around a tetrastyle temple on two degrees and surmounted by a cross (separating the letters O and X). A cross in the middle of the temple).

Photo of a coin sold by Classical Numismatic Group, link to the sale and their website: https://www.cngcoins.com/Lot.aspx?LOT_ID=2027&BACK_URL=%2fLots.aspx%3fIS_ADVANCED%3d1%26ITEM_IS_SOLD%3d1%26ITEM_DESC%3dcharlemagne%2bcologne%26SEARCH_IN_CONTAINER_TYPE_ID_1%3d1%26SEARCH_IN_CONTAINER_TYPE_ID_2%3d1%26SEARCH_IN_CONTAINER_TYPE_ID_3%3d1%26SEARCH_IN_CONTAINER_TYPE_ID_4%3d1%26TABS_TYPE%3d3%26CONTAINER_TYPE_ID%3d3%26VIEW_TYPE%3d0%26MAX_COUNT%3d10000%26PAGE%3d1.

One copy preserved at the Münzkabinett der Staatlichen Museen of Berlin, link to the page of their website showing the photo of the coin: http://www.smb-digital.de/eMuseumPlus?service=ExternalInterface&module=collection&objectId=2355447&viewType=detailView.

This type is known with a letter under the bust, indicating the mint: C for Cologne, F for Florence, M for Milan and V for Venice. The attribution to the cologne mint is discussed, Confluentia is also proposed.