Have there been any actual examples of a hero being rewarded with the hand of a princess in marriage?
Particularly one who wouldn't already be in a position (socially speaking) to marry said princess even without the supposed heroism.
Does it count if he crushed his enemies, saw them driven before him, and heard the tears and lamentations of their women?
>>2766156
ilya muromets
It almost definitely happened throughout history that the occasional princess would marry a soldier or the occasional prince would marry a peasant girl. Whether these people are "heroes" in a mythological sense is up to debate but we certainly have fables about it.
>>2767089
>that the occasional princess would marry a soldier
A warlord, maybe, but seeing as for most of history in most of the world women were property and wedding them was usually an investment, I can't see any good reason a princess would marry a common soldier.
Marriages of convenience were common. Some upstart rises in power but lacks noble status. Someone of noble birth is declining in power and so marries his daughter off to this mercenary to form an alliance that will help him.
A group of French nobles (two Raymonds and a Henry) from Burgundy who went to the aid of King Alfonso the Brave against the Almoravids during the Reconquista ended up marrying the King's three daughters.
There weren't exactly rank and file though, Henry was the son of a duke and a scion of a Capetian cadet branch, one Raymond was the son of a count, and the other was a count himself.