During the medieval times has there ever been an occurrence of someone of importance dying due to an allergy in food, then causing some historical event due to mistaken poisoning?
This is rather a tough question, as we don't have much data on pre-modern allergies to begin with. u/amp1212 explains in this post, and they also link back to a previous thread with contributions from u/michellesabrina and u/agentdcf.