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In page Catherine the Great:
"Although Catherine did not descend from the Romanov dynasty, her ancestors included members of the Rurik dynasty, which had preceded the Romanovs as rulers of Russia.[citation needed] She succeeded her husband as empress regnant, following the legal precedent of Empress Catherine I, who had succeeded her husband Peter I in 1725. Historians debate Catherine's technical status, whether as a regent or as a usurper, tolerable only during the minority of her son, Grand Duke Paul.