Peter III of Russia
Empress Elizabeth arranged for Peter to marry his second cousin, Sophia Augusta Frederica (later Catherine the Great), daughter of Christian August, Prince of Anhalt-Zerbst and Johanna Elisabeth of Holstein-Gottorp. The young princess formally converted to Russian Orthodoxy and took the name Ekaterina Alexeievna (i.e., Catherine). They married on 21 August 1745. The marriage was not a happy one but produced one son, the future Emperor Paul, and one daughter, Anna Petrovna (20 December 1757 – 19 March 1759). Catherine later claimed that Paul was not fathered by Peter: that, in fact, they had never consummated the marriage. During the sixteen years of their residence in Oranienbaum, Catherine took numerous lovers, while her husband did the same in the beginning.
Catherine I of Russia
Catherine went with Peter on his Pruth Campaign in 1711. There Catherine was said to have saved Peter and his Empire, as related by Voltaire in his book "Peter the Great". Surrounded by overwhelming numbers of Turkish troops, Catherine suggested before surrendering, that her jewels and those of the other women be used in an effort to bribe the Ottoman grand vizier Baltacı Mehmet Pasha into allowing a retreat.