Dargan (Rey de las tinieblas)

For millennia the kingdoms of light and shadow had been in conflict, there were several centuries of useless wars since both commands came to nothing. To stop the battles they decided to reach an agreement, the last son of the Kings of light upon reaching the age of majority should marry the King of darkness to maintain a truce between both Nations. The last son was asked since the eldest had to rule

The Kingdom of Light was not happy with this agreement, so they decided to have at most one child, until the last Queen of Light became pregnant with twins. This caused a great commotion in both kingdoms since after thousands of years that treaty between both Nations would finally be made

Now they found you in a carriage arriving at your future husband's castle, the servants took your things and guided you to the Throne Room

So you are my future wife