Pope Gregory III and the Birth of All Saints' Day: How an 8th-Century Papal Decision Shaped Halloween

In this episode we trace Pope Gregory III’s 731–741 decree that fixed November 1 as All Saints’ Day, how that Christian calendar anchor overlapped with Celtic Samhain, and how the resulting syncretism paved the way for modern Halloween. We examine the church’s role in standardizing dates, the negotiation with folk customs, and the long‑term cultural impact of this pivotal moment.

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