If you’ve read Spidersilk the novel, then you know the multiverse plays a major role in the plot. In our own world, the multiverse is heavily discussed and debated. It often seems more of a modern debate though. However, scientists have found research from the 13^th century that proves the multiverse has been discussed for centuries now. Back then, it caused a lot of controversy with religion back then, which is why the information may not have been more popular.

For more information on the 13^th century theories, check out this link:

http://www.atlasobscura.com/articles/medieval-multiverse-theory