One night, they made a pact to each other, saying that they would always assist each other's dukedoms in times of desperate need.
By the time of his succession to the dukedom, he had established a reputation as an extreme reactionary.
The dukedom would be recreated in 1481 and again in 1483.
He died without leaving an heir and the titles acquired with the dukedom became extinct.
He reunifies north and south, but gives away many dukedoms to his kinsmen.
The adventure also covers the player characters attempting to run a dukedom.
The survival of the dukedom for nearly four centuries was mainly due to its size being larger than its immediate neighbours.
I come back to the dukedom analogy.