This is a problem that a lot of Invictus content has but it is particularly noticeable in the Arabian kingdoms, which all get claims on huge areas as soon as the game starts and expand at ridiculous speed. I understand that it's difficult to make engaging content for small tags that didn't expand very quickly during the game's timeframe, but I think the game would benefit from something like a "historical focuses" option that just stops the AI from doing the wacky expansionist alt-history path in every single game.