Plural of 'eyre', referring to itinerant royal courts or judicial circuits in medieval England.
From Old French 'eire' or 'erre' (journey, circuit), the 'eyre' was a system where judges traveled circuits, giving 'eyres' as the plural form used in medieval legal records.
Medieval 'eyres' revolutionized English justice—judges literally rode the countryside bringing law to remote areas, and the word preserved in 'eyres' is a monument to an early form of circuit courts!
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