in what century was halloween first introduced?

Halloween grew out of the ancient Celtic festival of Samhain, which was celebrated roughly 2,000 years ago, so its roots lie in the 1st century BCE/CE era, not a specific later “modern” century like the 18th or 19th.

When Halloween Was First Introduced

Most historians trace what became Halloween back about two millennia to Celtic peoples in what is now Ireland, the UK, and parts of France, who marked Samhain around the turn of the 1st century BCE/CE. This festival marked the end of the harvest and the beginning of the dark half of the year, when the boundary between the living and the dead was believed to blur.

Later, in the 7th–8th centuries, Christian church leaders fixed All Saints’ Day on November 1, with the evening before eventually called All Hallows’ Eve, then Halloween. So if the question is “in what century was Halloween first introduced?”, historians usually answer in terms of its roots: around the 1st century period for Samhain, then the 7th–8th centuries for the Christian “All Hallows” layer that shaped the name and date.

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