A joint captain or co-captain, especially in military or nautical contexts where two officers share command responsibilities.
From French 'co-' (with, together) + 'capitaine' (captain), itself from Latin 'capitaneus' (chief). The term emerged in medieval military usage when shared command was sometimes necessary.
In naval history, copataines were often appointed during transitions or when two rival noble families needed to share power—it was a medieval way of creating a power-sharing agreement before democracy existed.
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