Imperial, royal and noble ranks - Wikipedia
https://en.wikipedia.org/wiki/Imperial,_royal_and_noble_ranks
• The word monarch is derived from the Greek μονάρχης, monárkhēs, "sole ruler" (from μόνος, mónos, "single" or "sole", and ἄρχων, árkhōn, archon, "leader", "ruler", "chief", the word being the present participle of the verb ἄρχειν, árkhein, "to rule", "to lead", this from the noun ὰρχή, arkhē, "beginning", "authority", "principle") through the Latinized form monarcha.• The word sovereign is derived from the Latin above.
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