Known. A handful of Viking silver coins was found on the Isle of Man.
The hoard has 36 silver coins, some whole and some broken. They date from AD 1000 to 1065. They show English kings and a Norse king from Dublin. The coins were minted in places that include York, London, and Dublin.
The page does not say what is still argued.
https://www.ancient-origins.net/news-history-archaeology/viking-coin-hoard-isle-man-0021530