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All Saints' Day is a Christian feast day dedicated to honoring all saints, both famous and unknown. It is observed by various Christian churches around the world as a significant religious commemoration.
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All Saints' Day is a Christian holy day celebrated in honour of all the saints of the Church, whether they are known or unknown.
From the 4th century, feasts commemorating all Christian martyrs were held in various places, on various dates near Easter and Pentecost. In the 9th century, some churches in the British Isles began holding the commemoration of all saints on November 1st, and in the 9th century this was extended to the whole Catholic Church by Pope Gregory IV.