The Vikings: Hell’s Angels with boats.
Rolf the Granger killed a guy, because his family was in good with the Queen he got exiled instead of killed.
He got some rough customers together and took over “Normandy”, it wasn’t the land of the Northmen until Rolf.
From Normandy they took England, Sicily, Southern Italy, the Crusader Kingdom of Antioch, and twice came within one battle of taking the largest empire of the day, the Byzantines.