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.
Blanche of Bourbon
It is not surprising that the history of Peter was rewritten in later years. Male descendants of King Henry II, the bastard half-brother of King Peter, and his slayer, would end up marrying female descendants of Peter. Henry III, who was grandson of Henry II, would marry Catherine of Lancaster, the daughter of John of Gaunt, the Duke of Lancaster, and Constance of Castile, daughter of Peter. Thus subsequent descendants of the joined lines would try to ameliorate the iniquity of Peter chronicled by the faction of Henry II. Bourbon rulers had a stake in sanctifying the image of Blanche, a distant member of their ancestral lineage.