"All Saints´ Day, also known as All Hallows´ Day, Hallowmas,[better source needed] the Feast of All Saints, or Solemnity of All Saints, is a Christian solemnity celebrated in ...
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honour of all the saints, known and unknown. Its intent is to celebrate all the saints, including those who do not, or are no longer, celebrated individually, either because the number of saints has become so great or because they were celebrated in groups, after suffering martyrdom collectively. 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 1 November, and in the 10th century this was extended to the whole church by Pope Gregory IV." - (en.wikipedia.org 25.12.2020)
