Dynasty

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late Middle English: from French dynastie, or via late Latin from Greek dunasteia ‘lordship, power’, from dunastēs (see dynast).

wiktionary

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From Middle French dynastie, from Late Latin dynastia, from Ancient Greek δυναστεία(dunasteía, “power, dominion”).

etymonline

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dynasty (n.)

"a race or succession of sovereigns from the same line or family governing a country," mid-15c. (earlier dynastia, late 14c.), from Medieval Latin dynastia, from Greek dynasteia "power, lordship, sovereignty," from dynastes "ruler, chief," from dynasthai "have power," which is of unknown origin.