Augustus
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According to the definitions of Paganism on Wikipedia, and information provided on other accepted sites, the Celtic & Druid religion (religions?) were pagan…. They engaged in human sacrifice, to an extreme at times, from what archaeologists have found.
Take care, my cousin.
Yes, but that has nothing to do with Halloween and there are very few sources that say anything about druids (a few Roman ones, then a few things written by Christians a millennium later that don't say anything about a festival of the dead where druids did XYZ.
Hence the History.com article is relying on made up information.
That All Saints Day ended up in the Autumn seems to have been either due to English or German tradition, not "Celtic" one anyway.