Catholic Christians celebrate All Saints’ Day on November 1. In the Catholic calendar, this is a holiday of the highest rank, when all believers must attend mass.

The history of All Saints’ Day in England and Ireland has deep pagan roots. The event is associated with the Celtic holiday of Samhain, which symbolized the end of the harvest. After the adoption of Christianity, the holiday was called All Saints’ Day. In the 8th century, Pope Gregory IV decreed that all Catholics should celebrate All Saints’ Day on November 1. On All Saints’ Day, it is customary to honor the memory of the dead.