You easily cite from memory the written records where the priests of old gave the Kings of old the power to annul the holy oath of matrimony if one of the two partners directly applies to the King (even if that's extremely rare), and your brother did so back then. Therefore, the Archpriest has no reason to interfere in this particular matter.
The Archpriest stares at you, bemused, for a while, before waving his hand.
"Still, the divorce left an impression on the people and that's why Romuald had to be moved away from power. I can see, however-" The Archpriest stands up. "That you, King Feodh, are more compliant and harmonious with traditions and religion of our land. That is satisfactory enough." He bows his head.
"It is time I rejoin my brothers and sisters. Fare thee well." And so he leaves.
5to6
In other news, you receive report from the gold mines a few days later. Apparently, the new soil holds well and the miners continue to exploit wealthy veins of gold, bringing extra profits to the Treasury this year!
875 AD, End of the Year
As you finish your morning meal, the advisor brings the Scrolls of Kingdom Status to your table:
Happiness: 7
Population: 5
Economy: 9
Army: 6
"My liege! I am pleased to announce that our Treasury is full with valuables and coinage. It would be most satisfying to see it spent on some noble or grandiose thing, don't you agree?"
A) Naaaah. *take a swim in your sea of riches!*
B) Give a coin to each peasant and vagrant in the Kingdom in a public show of generosity.
C) Hire artisans to produce a large bronze statue of you in the middle of the capital city!
D) Declare a new budget for the Army, increasing its yearly expenses but also its overall effectiveness.
E) Procure foodstuffs and send the money to poorly developed areas so that people might prosper and find new places to live for their extended families!
F) Send some of the wealth to your aunt, Queen Sela, to boost the relations between your nations.
G) Sponsor the refurbishment of the Holy Library, where holy texts both ancient and modern are stored; the clergy will sure like this!