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The early church remembered saints and martyrs collectively on various dates. Ephrem the Syrian mentions a feast held on May 13 at Edessa around 359. Pope Bonifice IV dedicated the Pantheon in Rome to "Saint Mary and all the martyrs" on this date around 609.<ref>Smith, C., "All Saints' Day," ''New Catholic Encyclopedia'' (2003).<br/>In classical times, the Romans observed Lemuria on May 9, 11, and 13. A ''lemure'' is a restless spirit, similar to a vampire. Patriarch John Chrysostom (d. 407) put All Saints' Day on the Sunday after Pentecost. The Orthodox Church still celebrates on this date.</ref>

The early church remembered saints and martyrs collectively on various dates. Ephrem the Syrian mentions a feast held on May 13 at Edessa around 359. Pope Bonifice IV dedicated the Pantheon in Rome to "Saint Mary and all the martyrs" on this date around 609.<ref>Smith, C., "All Saints' Day," ''New Catholic Encyclopedia'' (2003).<br/>In classical times, the Romans observed Lemuria on May 9, 11, and 13. A ''lemure'' is a restless spirit, similar to a vampire. Patriarch John Chrysostom (d. 407) put All Saints' Day on the Sunday after Pentecost. The Orthodox Church still celebrates on this date.</ref>

Gregory III dedicated a chapel in St. Peter's Basilica to "all the saints" on November 1 around 731. The Northumbrian monk [[Bede]] promoted the new date in his ''Martyrology''. Around 835, Gregory IV asked Frankish Emperor [[Louis the Pious]] to proclaim a feast on this date.<ref>Strayer, Joseph R., "All Saints' Day," ''Dictionary of the Middle Ages'', (1983).<br/>Cross, F. L., and Livingstone, E. A., "All Saints' Day", ''The Oxford Dictionary of the Christian Church'' (1997).<br/>Smith, C., "All Saints' Day," ''New Catholic Encyclopedia'' (2003).<br/>Some authorities claim that Gregory IV moved All Saints' Day from May 13 to November 1 to thin out Easter-related crowds in Rome. But May 13 continued to be observed as All Martyr's Day even after All Saints' Day was put on November 1. All Martyr's Day was not suppressed until the 11th century.</ref>

Gregory III dedicated a chapel in St. Peter's Basilica to "all the saints" on November 1 around 731. The Northumbrian monk [[Bede]] promoted the new date in his ''Martyrology''. Around 835, Gregory IV asked Frankish Emperor [[Louis the Pious]] to proclaim a feast on this date.<ref>Strayer, Joseph R., "All Saints' Day," ''Dictionary of the Middle Ages'', (1983).<br/>Cross, F. L., and Livingstone, E. A., "All Saints' Day", ''The Oxford Dictionary of the Christian Church'' (1997).<br/>Smith, C., "All Saints' Day," ''New Catholic Encyclopedia'' (2003).<br/>Some authorities claim that Gregory IV moved All Saints' Day from May 13 to November 1 to thin out Easter-related crowds in Rome. But May 13 continued to be observed as "All Martyr's Day" until the 11th century.</ref>

All Saints' Day is mentioned by the ''Anglo-Saxon Chronicle'' in its entry for 1083.<ref>1083: O.E. Chron. (Laud MS.) Translated as "And in this same year departed Matilda, queen of King William, on the day after All-Hallow-mass." See "[https://avalon.law.yale.edu/medieval/ang11.asp The Anglo-Saxon Chronicle: Eleventh Century]".</ref>

All Saints' Day is mentioned by the ''Anglo-Saxon Chronicle'' in its entry for 1083.<ref>1083: O.E. Chron. (Laud MS.) Translated as "And in this same year departed Matilda, queen of King William, on the day after All-Hallow-mass." See "[https://avalon.law.yale.edu/medieval/ang11.asp The Anglo-Saxon Chronicle: Eleventh Century]".</ref>