May 24 is a sacred holiday, which marks the cultural development of the Slavic peoples through the image and work of the divined brothers Cyril and Methodius, who are the founders of Slavic literacy and literature. Due to their great merits, they were canonized as saints shortly after their death. It is not by chance that today various attributes are used for the brothers Cyril and Methodius, such as first-teachers, equal-to-apostles, brothers-who-changed-the-world. In 1980, Pope John Paul II declared them co-patrons of Europe because of their missionary activity, through which they united the East and West of Europe.
Their biography records that they were born in Thessaloniki, Macedonia, as Constantine and Methodius. The Moravian mission is the most significant part of their life journey, which began at the request of the Moravian prince Rostislav as a response to the political situation and religious problems in the country. He asked for teachers who would preach the word of God in an understandable Slavic language. The missionaries who were sent were Cyril and Methodius. The Slavs had no letters, so Cyril had to compose an alphabet of 38 letters and translate the necessary books into the Slavic language. To compile this first Slavic alphabet (the Glagolitic script), for the first translations from Greek into the Slavic language, Cyril used the language of the Macedonian Slavs from Thessaloniki and the surrounding area. According to legend, he baptized 54,000 Slavs in the Bregalnica Mission. Cyril died in Rome in 869 and today his relics rest in the Roman Church of Saint Clement. Methodius died in 885 and was buried in the Moravian capital of Velegrad.
In accordance with the Law on Holidays in the country, May 24 - the day of the All-Slavic educators brothers Cyril and Methodius is a public holiday and non-working day for all citizens.