Charles VI

, also known as Charles the Mad, was a 14th century French king. In 1388, he was awoken by a Cyberman and handed a time gate, which he was instructed to bury outside the walls of Paris. Terrified of the being, Charles took his horse and complied, planting the seeds for a Cyberman invasion of Earth many centuries later.

The incident passed into legend. Old artwork depicted Charles receiving a golden orb from a silver demon. (AUDIO: The Gates of Hell)

Behind the scenes
Charles' daughter is Queen Isabella, however this connection is not known to have been made in any Doctor Who fiction.