Sophie becomes Catherine through apprenticeship
Sophie of Anhalt-Zerbst, a minor German princess, arrived in Russia at fourteen in 1744, learned Russian, converted to Orthodoxy, and married the heir Peter, who was erratic and openly contemptuous of Russia. She spent roughly eighteen years as a sidelined grand duchess, reading, building relationships at court, and making herself visibly Russian. In 1762 she overthrew her husband, now Peter III, with the backing of the guards regiments, and he died in custody days later.
