Karl Leopold of Mecklenburg-Schwerin, lived 1678–1747, Duke of Mecklenburg-Schwerin from 1713 to 1747. Second son of Frederick, Duke of Mecklenburg-Grabow, and Christine von Hessen-Homburg. Succeeded his brother Frederick William, Duke of Mecklenburg-Schwerin, in 1713. His third wife was the Grand Duchess Catherine Ivanovna of Russia, daughter of Ivan V and Praskovia Saltykova. Father of Grand Duchess Anna Leopoldovna of Russia. Romanov-in-law.
The Princess Alexandrine of Prussia (1803-1892). She was a daughter of King Friedrich Wilhelm III and his wife, The Duchess Luise of Mecklenburg-Strelitz. She was the wife (1822-1837) and Sovereign Grand Duchess of Mecklenburg-Schwerin (1837-1842) as the wife of Sovereign Grand Duke Paul Friedrich. Her surviving children were Sovereign Grand Duke Friedrich Franz II, The Duke Wilhelm, and The Duchess Luise.
Bogislaw X of Pomerania, the Great, lived 1454 – 1523, Duke of Pomerania from 1474 until his death in 1523. Married Anna Jagiellon (Anna pf Poland) daughter of Casimir IV Jagiellon, King of Poland. Son of Eric II, Duke of Pomerania-Wolgast and Sophia of Pomerania-Stolp. 6Xgreat-grandfather of Catherine the Great.
Eric II or Erich II, lived between 1418 and 1425 –1474, a member of the House of Pomerania (also known as the House of Griffins) and was ruling Duke of Pomerania-Wolgast from 1457 to 1474. Married Sophia, daughter of Bogislaw IX of Pomerania-Stolp and heiress of Eric I of Pomerania-Stolp, who had also been king of the Kalmar Union. Son of Wartislaw IX of Pomerania-Wolgast and Sophia of Saxe-Lauenburg, a daughter of Eric IV of Saxe-Lauenburg. 7X great-grandfather of Catherine the Great.
John Casimir, Count Palatine of , Zweibrücken 1589–1652, son of John I, Count Palatine of Zweibrücken and his wife, Duchess Magdalene of Jülich-Cleves-Berg. Married Catherine of Sweden. 3X maternal great-grandfather of Catherine the Great.
George, Duke of Brunswick-Lüneburg, lived 1582–1641,ruled as Prince of Calenberg from 1635, a son of William, Duke of Brunswick-Lüneburg (1535–1592) and Dorothea of Denmark (1546–1617), daughter of Christian III of Denmark and Dorothea of Saxe-Lauenburg. Married Anne Eleonore, daughter of Louis V, Landgrave of Hesse-Darmstadt. 3X maternal great-grandfather of Catherine the Great.
Alexei Petrovich Romanov, lived 1690 –1718,was a Russian Tsarevich. Son of Tsar Peter I (the Great) and his first wife Eudoxia Lopukhina. Father of Peter II. Married Princess Charlotte of Brunswick-Wolfenbüttel, sister-in-law of Holy Roman Emperor Charles VI, ruler of the Habsburg Monarchy. Condemned to death for conspiring rebellion against his father, but died after interrogation and torture.