Sitan, in some Filipino stories, is like the scary boss of the underworld, a place called Kasanaan, where bad people went after they died. He's kind of like the devil in other stories you might have heard. Some people think the name "Sitan" might have come from a word that means "devil" in another language, which is interesting! He also had helpers that would try to get people to do bad things. Because the Philippines didn't have a lot of books or writing before, a lot of what we know about Sitan comes from stories the Spanish wrote down a long time ago.