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In Western Christianity, The Feast of Saint Bartholomew the Apostle, sometimes also referred to as Nathaniel, honors him as one of the twelve apostles of Jesus according to the New Testament, who is said to have been martyred for having converted Polymius, King of Armenia, to Christianity.
This day is traditionally observed as a Feast, which includes reciting the Gloria.
Here are some ways you can observe this day according to Western Christian tradition: