When Slenderman arrived on Earth, he was spotted by a group of Ancient Egyptians. When he attempted to communicate with them, they all killed themselves the next day.
Other people say that Slenderman is the offspring of a eldritch being such as Cthulhu
Other ancient civilizations across the world each had their own encounters with Slenderman and made stories inspired by him.
According to the Scottish, Slenderman, or Fear Dubh, roamed the woods looking for children to feast on.
The Taino culture of Ancient Columbia believed Slenderman was a creature named Op'a, a nocturnal humanoid without a face that stalks and kills it's victims.
Ancient Babylonians believed in a version of Slenderman called Alu, a half-man, half-devil creature without a face.
Ancient Egyptian hieroglyphics also depict a humanoid creature with multiple limbs.
The Germans believed in a demonic, faceless creature know as Der Schlanker Mann, or Der Grobbmann, who would live in the black woods and kill those who entered its territory.
