Bulgarian descends from Old Church Slavonic - the first Slavic language to be standardised in writing in the 9th century. Originally based on the Glagolitic script developed by the Byzantine Greek Saints Cyril and Methodius, Cyril’s disciples at the Preslav Literary School of the First Bulgarian Empire developed the Early Cyrillic alphabet a few decades later, which was then adapted for use by many Slavic languages over time. Bulgaria also stands out in terms of European body language: especially in older generations, head nods map more to the meaning of “no”, while head shakes tend to indicate “yes”. The number of Bulgarian Sign Language users is an estimate, and a lack of Bulgarian Sign Language Interpreters has been recorded. Among the local languages not established by the chosen sources so far are Rusyn / Ruthenian, as well as Ukrainian, the speaker base of which has recently grown due to the large number of refugees.