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 of Navarre
In 1516, two columns led by King John III and Pedro, Marshal of Navarre, crossed the Pyrenees south and attempted to reconquer Navarre but they failed to progress into the heartland of the kingdom. Devastated by the defeats undergone, John retreated to Monein, and died on 17 June 1516. Queen Catherine did not outlive her husband much longer, and died in her domain of Mont-de-Marsan on 12 February 1517, just a few months later. By then, she had given birth to 13 children (other sources point to 14).