[Nordlux Bellator in Bulgaria sent me these comments. I also asked him to explain the term "slav" because I believe its not fully "real". Jan]
”There are 3 giant linguistic groups among whites Slavs, Teutons and Romans”
I must remind you that ;
A/there is no such thing such ”slavs” not like tribal group anyway.
B/ The Cyrillic script was developed in First Bulgarian empire
The Cyrillic script (/sɪˈrɪlɪk/) is a writing system used for various languages across Eurasia and is used as the national script in various Slavic, Turkic, Mongolic and Iranic-speaking countries in Eastern Europe, the Caucasus, Central Asia and Northern Asia.
In the 9th century AD the Bulgarian Tsar Simeon I the Great, following the cultural and political course of his father Boris I, commissioned a new script, the Early Cyrillic alphabet, to be made at the Preslav Literary School in the First Bulgarian Empire, which would replace the Glagolitic script, produced earlier by Saints Cyril and Methodius and the same disciples that created the new Slavic script in Bulgaria. The usage of the Cyrillic script in Bulgaria was made official in 893. The new script became the basis of alphabets used in various languages, especially those of Orthodox Slavic origin, and non-Slavic languages influenced by Russian. For centuries Cyrillic was used by Catholic and Muslim Slavs too (see Bosnian Cyrillic). As of 2019, around 250 million people in Eurasia use it as the official alphabet for their national languages, with Russia accounting for about half of them. With the accession of Bulgaria to the European Union on 1 January 2007, Cyrillic became the third official script of the European Union, following Latin and Greek.
c/ Old ”church slavonic” is the politically corect name for Old Bulgarian and this was the basis for russian,serbian and so on.
Main article: Old Bulgarian language
Early Cyrillic Alphabet.
Old Bulgarian was the first literary period in the development of the language. It was a highly synthetic language with a rich declension system as attested by a number of manuscripts from the late 10th and the early 11th centuries. Those originate mostly from the Preslav and the Ohrid Literary School, although smaller literary centers also contributed to the tradition. The language became a medium for rich scholarly activity — chiefly in the late 9th and the early 10th century — with writers such as Constantine of Preslav, John Exarch, Clement of Ohrid, Chernorizetz Hrabar and Naum of Preslav (Naum of Ohrid). Most of their works are preserved through later copies, many of which are from neighboring Balkan countries or Russia.
The name “Old Bulgarian” was extensively used in the late 19th and the first half of the 20th century synonymously with Old Church Slavonic to describe the literary language of a number of Slavic peoples from the 9th until the 12th century. Although "Old Bulgarian" is still used in a number of sources with the meaning "Old Church Slavonic", there is a growing tendency for the name to be applied only to the language of manuscripts from the First Bulgarian Empire (Bulgarian editions of Old Church Slavonic), excluding manuscripts from other editions.
Old Church Slavonic played an important role in the history of the Slavic languages and served as a basis and model for later Church Slavonic traditions, and some Eastern Orthodox and Eastern Catholic churches use this later Church Slavonic as a liturgical language to this day.
Kampf bis zum Endsieg!