you need positive relations to make alliance and royal marriage possible, this has been mentioned in the change log thread of Johan a few hours before release. That's why only slightly negative relations give a -1000 opinion modifier.
It can happen before 1500 if you lack an heir. If I remember correctly, high stability should make it less likely. It's quite the pain to fight through but it adds a lot to the challenge of playing England![]()
My first game as England was ridiculous. I got a Low Fertility event, a Lollard Heresy Event, the War of the Roses Event followed by a Civil War event all in the space of a year, it was around 1446-1447. Then a majority of my provinces declared against me. And as BobbyDylan posted above it was 15k stack after stack. I eventually ran out of manpower and had to restart.
The war ends when you have positive stability and an heir. And probably the original pretender dead, I suppose. The War of the Roses started because Henry VI didn't have an heir, so it makes sense that the various potential claimants aren't going to give up until the succession can no longer be disputed.
The Jacobites did basically this for quite a long time.This makes absolutely no sense---declaring in favor of a dead king with a non-existent army, and thus facing off against the victorious king and his very extant army, would be something nobody would do
The War of the Roses is broken. Even after the enemy king is six feet under and his army obliterated, provinces will, for no apparent reason, continue declaring for him. This makes absolutely no sense---declaring in favor of a dead king with a non-existent army, and thus facing off against the victorious king and his very extant army, would be something nobody would do---and continues for decades, resulting in revolts everywhere. Apparently the developers forgot to script an end to the war. Whatever the case, the war, the revolts, and the war's associated events---which cause even MORE revolts---make playing as England nigh-impossible.