What was the cause of Charlemagne's death?

How do they know? What were his symptoms? This answer is very unsatisfactory.

I’m guessing he died from neumonia?

Had it a couple of times. The most painful thing ever. Also known as the devils grip. Can't breathe without extreme pain

Pleurisy is inflammation of the pleura. It's usually caused by another condition, such as an infection, but sometimes no cause can be identified. The pleura are two thin sheets of tissue that separate the lungs and ribcage. One is attached to the ribcage and the other is attached to the lungs.

the description didnt exactly tell how he died

Uninitialized, no in these times they probably didn't really know.

I had pleurisy when I was about 13 -14, omg it’s so painful

Player #1474571, I once had pneumonia and pleurisy at the same time. It was awful, couldn't breathe, couldn't speak, couldn't eat, had no energy, and so it was unforgettable. I never want to go there again!

Player #71348988, painful across the back also with every breath.

What is pleurisy?

Player Teresa611, I wondered the same thing