10 Crowns - Elizabeth II Battle of Hafrsfjord

The Battle of Hafrsfjord, fought circa 872 AD off the southwestern coast of Norway, was the decisive engagement through which Harald Fairhair consolidated rival petty kingdoms into a unified Norwegian realm. It is not a battle extensively documented in contemporary sources — the main accounts come from later saga literature, particularly Snorri Sturluson's Heimskringla, written some three and a half centuries after the fact.

The Isle of Man's connection to the Viking world is genuine enough — Norse settlement on the island dates to the ninth century, and the Manx kingdom remained under Norwegian suzerainty until 1266.