- On May 13, 609 A.D., Pope Boniface IV dedicated the Pantheon in Rome in honor of all Christian martyrs and the Catholic feast of All Martyrs Day was established. Pope Gregory III later expanded the festival and moved the observance from May 13 to November 1.
- The influence of Christianity spread into Celtic lands, where it gradually blended with and supplanted older Celtic rites. In 1000 A.D., the church made November 2 All Souls’ Day, a day to honor the dead. It was probably done to replace the Celtic festival.
- All Souls’ Day was celebrated similarly to Samhain, with big bonfires, parades and dressing up in costumes as saints, angels and devils. The All Saints’ Day celebration was also called All-hallows or All-hallowmas, and eventually, Halloween.
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