All Saints Day
All Saints Day is a feast day celebrated by the Western Church on 1st of November in remembrance of all the saints, especially those who are not otherwise acknowledged.

All Saints Day can be traced back to the 4th century. Originally, it was celebrated by the Eastern Church as the feast of martyrs of the whole world. In 835 Pope Gregory IV made November 1st as the feast day for all the Saints.

During the Reformation, the Protestant churches extended the definition of "saints" to include all believers. As a result, the feast of All Saints became a celebration of the unity of the entire Church. In medieval England the festival was known as All Hallows, hence the name Halloween (All Hallows' eve) for the preceding evening.