Royalties similar to or like Peter III of Russia

Empress of All Russia from 1762 until 1796 – the country's longest-ruling female leader. She came to power following a coup d'état that overthrew her husband and second cousin, Peter III. Wikipedia

Elizabeth Petrovna (Елизаве́та (Елисаве́та) Петро́вна) (29 December 1709 – 5 January 1762), also known as Yelisaveta or Elizaveta, reigned as the Empress of Russia from 1741 until her death in 1762. She remains one of the most popular Russian monarchs because of her decision not to execute a single person during her reign, her numerous construction projects, and her strong opposition to Prussian policies. Wikipedia

The elder daughter of Emperor Peter I, the Great of Russia and his wife Empress Catherine I. Her younger sister, Empress Elizabeth I, ruled between 1741 and 1762. Wikipedia

The Emperor of Russia (Tsar) from 1801, the first King of Congress Poland from 1815, and the Grand Duke of Finland from 1809 to his death. The eldest son of Emperor Paul I and Sophie Dorothea of Württemberg. Wikipedia

The second wife and Empress consort of Peter the Great, and Empress regnant of Russia from 1725 until her death in 1727. Said by Voltaire to be nearly as extraordinary as that of Peter the Great himself. Wikipedia

The reigning imperial house of Russia from 1613 to 1917. The Romanovs achieved prominence as boyars of the Grand Duchy of Moscow and later of the Tsardom of Russia under the reigning Rurik dynasty, which became extinct upon the death of Tsar Feodor I in 1598. Wikipedia