It could be a reference to 'The King of Science Fiction'. Maybe it's the name of a science - fiction related entity like a magazine, a book series, or a character in a science - fiction story.
In most cases, 'El Rey' is not based on actual events. It's more of a fictional narrative crafted for entertainment purposes. The plot and characters might be inspired by various elements but not by real-life happenings.
There's the Bearer of the Curse, who is the main character. Also, Nashandra is important as she has her own agenda. And the Emerald Herald is quite significant as she guides the Bearer of the Curse in some ways.