Eowyn was a Celtic king from the First Century a.t.b. whose first year of rule became the establishing year of the Imperial Calendar used by the Holy Britannian Empire.

Eowyn rose to prominence when he successfully stopped the Romans, led by Julius Caesar, from conquering the British Isles to become part of the Roman Empire. The Celts responded by choosing Eowyn as the Celtic super-king. His descendants would have also stopped Claudius' conquest of Britain in 43 AD, which would otherwise prevent the timeline from diverting. It is unknown how much his dynasty have ruled until coming of Alfred the Great. (Historically, Julius Caesar indeed failed to conquer Britannia, however, Claudius managed to conquer Britain, up until Scotland, starting from 43 AD to around 54 or 55 AD).