The entire rank, class, or body of barons collectively; also, the domain, territory, or jurisdiction of a baron.
From baron + -age suffix meaning 'a group, condition, or domain.' Norman French 'baron' entered English through the Conquest of 1066, and -age developed into a productive suffix for creating collective nouns.
In medieval England, the 'baronage' wasn't just a social rank—it was a political power base: barons controlled land, armies, and laws in their territories, and their collective power often challenged the king's authority, leading directly to events like the Magna Carta.
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