Started Genoa game, allied France, get called into war for French cores against England. France also calls in Castile, who gets to Labourd first and takes it for themselves. Well, France wants that piece of land, and isn't going to stop fighting until it (somehow) gets it. Result for me: a crippling, ever-increasing Call for Peace:
I finally tap out after 12 years, thinking the AI would probably make peace right after I do so. Nope! Twenty years after the start of the war (sometime in June 1469):
France REALLY wants Labourd. Almost 60 years after the war started:
STILL NO PEACE. When the 90th anniversary of the war comes around, I decide to take matters into my own hands. I break my alliance with France, ally both Austria and the Pope, and declare war once the truce is over. THEY STILL WON'T MAKE PEACE:
I plow my way through Castile to Labourd and end their occupation. Almost immediately afterwards:
And then, just a few days later, FINALLY:
After almost 99 years of war, France takes back one core. The war may have lasted the rest of the campaign if I hadn't stepped in.