Joint or shared sovereignty or rule; the condition of two or more monarchs reigning together over the same territory.
From 'co-' (together) and 'reign' (rule), blending Latin and Old French elements. This political term became more common during the Renaissance when kingdoms sometimes had co-monarchs.
Medieval and Renaissance kings sometimes had to share thrones with their heirs or siblings—'coreign' arrangements were politically unstable disasters, but they showed how power had to be negotiated!
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