Annoying problem in My EU3

[TinCow]

Historical monarchs are generally bad when you're playing a minor nation. Nations which ceased to exist before the end of the game simply stop generating new monarchs and you end up stuck with whoever the last real monarch was for the rest of the game. That could easily be 200 years, and often the last monarchs have very poor stats because they were responsible for the end of their nation as an independent entity. Unless you're playing a major nation that existed throughout the entire period, I would not recommend using historical monarchs.

[Antagonist]

Indeed, Historical Monarchs mode only really works if you not only play a major nation, but actively try and behave as that nation historically did. It's fine as long as you're trying to recreate history, but as soon as the setting significantly diverges from what actually happened IRL (which seldom takes long) it loses all context and eventually breaks down. A bit like getting the Marian Reforms in RTW even if Rome is a weakling one-province protectorate of the mighty Gallic Empire or whatever. The whole time-warping thing is particularly odd.

FWIW the monarch lists for the Irish factions are pretty bizarre and off-the-wall anyway, not one of EU3's most accurately modelled regions.

Antagonist