13 Ghosts Wiki

Basileus was an astronomer who lived during the 15th century.

At one point, he was possessed by a demonic entity of some kind and wrote The Arcanum. Inside, he put explicit instructions on how to build and activate a machine with which to open and control the Ocularis Infernum.


  • According to an early draft of the script for Thirteen Ghosts, when the church read The Arcanum, they burned Basileus at the stake for heresy.
  • In the actual plot used, it is unknown what became of Basileus after he wrote the book beyond the fact that he died.