Plural of barony; multiple territories or domains ruled by barons.
From barony (baron plus -y forming an abstract noun) with the plural -ies suffix. The -y suffix denotes an abstract quality or a place/domain ruled by someone.
The shift from barony → baronies shows English's quirky plural rule where singular -y becomes -ies, same pattern as lady→ladies and city→cities—a historical remnant of how English handles borrowed Romance vocabulary.
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