The Great Leader died while enjoying the company of a peasant boy. His death posed a problem for his inner circle. He'd created a cult of personality and in time the legend had grown larger than the man. To admit that he could, and did, die would create chaos and provide an opportunity to the opposition.
Necromancers were called and demons conjured to animate his body, but they erred in their incantations and Maxwell's Demons were summoned. Soon the people's homes had heat in winter and were cool in the summer.
The Great Leader became known as the Beloved Leader.