By the decision of the National Organizing Committee for the preparation and holding of the Day of Belarusian Written Language, the capital of the 26th Holiday in 2019 was determined the city of Slonim of the Grodno region.

Reference: according to archaeological data, in the center of modern Slonim in the first half of the XI century, a fortified village was located. On the pages of historical sources the name of the city in the Hypatian Codex under 1252 was mentioned as Uslonim, Vaslonim (from East Slavic “Uslon”, which means a barrier, the outpost).

At the end of the XIII century, the city finally became part of the Grand Duchy of Lithuania, and in 1531 received the Magdeburg Law. At the beginning of the XV century, Slonim remained a significant military fortification. It is no accident that Slonim regiment took part in the battle of Grunwald, the result of which was the defeat of the crusaders. In the XV-XVI centuries, the city was in the use of several large feudal lords. In 1586, it was owned by Lithuanian Chancellor Lev Sapieha, after - Sub-Chancellor of Lithuania Casimir Lev Sapieha, Oginski magnates. In 1591, Sigmund II Vasa gave the city the Coat of Arms: the olden lion with a double silver cross on a blue field.