I wonder if 2 leaders of different countries have ever had an affair with each other or got married ?
The only instances I can think of would be relations between the various royal families in Europe and even then it was not the leaders but the princesses and princes usually.
The most notable example would be Elizabeth II and Prince Philip.
Hedwig/Jadwiga of Poland and Jogaila of Lithuania, another marriage that united two states to create the largest realm in 14th/15th century Europe.
Also Jadwiga’s sister, Mary of Hungary and Sigismund of Luxembourg ( eventually King of Bohemia and HRE ) a marriage which attempted but failed to do the same thing, presaging the later Habsburg state.
Didn’t one of the Roman Emperors (Hadrian?) have a physical relationship with one of the barbarian kings or leaders? I vaguely remember reading about this but it could be just a SDMB legend.
Are we talking dynastic marriages where the marriage took place before one or other party had actually had become top dog? If so, Mary Duchess of Burgundy, whose marriage to Maximilian Hapsburg (later Holy Romen Emperor) brought the whole of Burgundy and the Low Countries into the Hapsburg domains, and through their son’s marriage to the daughter of Ferdinand and Isabella, also put the Hapsburgs on top in Spain.
This isn’t the same thing, but, for what it’s worth, Graça Simbine was married to Samora Machel for 11 years and to Nelson Mandela for 15 years. She’s still alive, so maybe she can marry a third president of a country. She’s apparently the only person to ever be married to presidents of two countries:
Now sovereign prince is not king, but it sounds like he was the big chief of Orange. I don’t know what Stadtholder means, but it also sounds like the big cheese. So when he married Mary, two sovereigns were joined.
Maybe someone more versed in European history can explain this further.
William also continued to rule England after Mary’s death. They were cousins, and he was third in line to the English throne (after Mary’s younger sister Anne), so everybody just said, okay, let him have it. And when he died with no heirs, Anne became Queen of England anyway.