That shit goes back to Normandy, northmen and the voyage charters of those bandits when they went mobile because you have less luck raiding if you fall out over the loot mid pillage and risk being overrun. It probably was common among the sea peoples who participated famously in the Bronze Age collapse, though there is less by way of tapestry or saga to confirm it.
If you think the Magna Carta was some new idea, your history teachers and parents must have treated you like some pretty little mushroom.