George Stephenson (inventor of the steam locomotive) had such a thick northern UK accent that he needed a translator when he presented his invention in London.
To ensure stable succession, it was normal to pretend Ottoman sultans were still alive for weeks or months after their deaths. Sometimes this went full Weekend at Bernie's, with their bodies propped up on horseback and made to wave to crowds.
Best friends Lydia Litvyak and Yekaterina Budanova were the top female aces of WW2. Together, they shot down 23 German aircraft. Both were killed in action.