The Aztecs and the Celts were separated by an entire ocean and several millennia, which means they never met and had absolutely nothing to do with other. Despite this, their respective beliefs around death and the afterlife have now become fused to create both Halloween and the Day of the Dead (or Día de los Muertos). The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.
Samhain: The Beginnings Of Halloween
The Celts occupied large swathes of northern Europe during the late Bronze Age and Roman era, and celebrated the festival of Samhain around the end of October each year, just as the nights began to get longer, as if to herald the approach of winter. On this one night, the Celts believed that the veil between the worlds of the living

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 IFL Science

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