A historical gold coin worth half the value of a sovereign, or a ruler with limited sovereignty.
Combining 'demi' (half) + 'sovereign' (absolute ruler, or gold coin). Emerged as a monetary unit in British currency systems.
A demisovereign was a real British gold coin—half the weight and value of a regular sovereign—which means some currency was literally named 'half-ruler' because of its physical relationship to another coin.
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