I was playing my Irish ruler who has been happily uniting the country. This is one my first games, so I saved my game before starting a war to press a de jure claim against a neighboring county (I'm new, I make mistakes, it's still a learning process for me), then launched my war. A few months into the war, my ruler died in battle. His young betrothed had just come of age, so I realized I should have waited a bit and had him enjoy married life, maybe get an heir or two before I sent him off to the battlefield. So, I loaded my saved game to do just that, didn't launch the war this time, married the sweetheart - only to have my ruler die "in repose" at about the same time as he would have died in battle.
Was this a coincidence? Or is the time of a ruler's death predetermined and the only thing that changes is the circumstances?
Sorry if this has been asked before, but I'm genuinely curious here.