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In Western Christianity, The Feast of Saints Cyril and Methodius, who were two brothers, Byzantine Christian theologians and missionaries, honors them as the "Apostles to the Slavs" for their work evangelising the Slavs and devising the Glagolitic alphabet, the first alphabet used to transcribe Old Church Slavonic.
This day is traditionally observed as a Memorial.
Here are some ways you can observe this day according to Western Christian tradition: