Saints Cyril and Methodius were 9th century Byzantine brothers who created the Glagolitic alphabet, the first alphabet for Slavic languages. They translated liturgical books into Old Church Slavonic and spread Christianity among West Slavs. Their work influenced Slavic cultural development and they are considered the "Apostles to the Slavs." Their students continued their missionary work and the Glagolitic alphabet was later used by Croats for liturgy. Several universities and Bulgaria's national library are named after the brothers for their contributions to Slavic languages and culture.

1. Saints Cyril and Methodius

2. Saints Cyril and Methodius (826–869, 815–885) were two brothers who
were Byzantine Christian theologians and Christian missionaries.
Through their work they influenced the cultural development of
all Slavs, for which they received the title "Apostles to the Slavs". They
are credited with devising the Glagolitic alphabet, the first alphabet
used to transcribe Old Church Slavonic. After their deaths, their pupils
continued their missionary work among other Slavs. Both brothers are
venerated in the Orthodox Church as saints with the title of "equal-to-
apostles". In 1880, Pope Leo XIII introduced their feast into the calendar
of the Roman Catholic Church. In 1980, Pope John Paul II declared them
co-patron saints of Europe, together with Benedict of Nursia.

3. Glagolitic script
The Glagolitic script is the oldest known Slavic alphabet. It is generally agreed to
have been created in the 9th century by Saint Cyril, a Byzantine monk
from Thessaloniki. He and his brother, Saint Methodius, were sent by the Byzantine
Emperor Michael III in 863 to Great Moravia to spread Christianity among the West
Slavs in the area. The brothers decided to translate liturgical books into the Old Slavic
language that was understandable to the general population, but as the words of that
language could not be easily written by using either the Greek or Latin alphabets, Cyril
decided to invent a new script, Glagolitic, which he based on the local dialect of the
Slavic tribes from the Byzantine Salonika region. After the deaths of Cyril and
Methodius, the Glagolitic alphabet ceased to be used in Moravia, but their students
continued to propagate it in the west and south. The Glagolitic alphabet was preserved
only by the Croats, who used it from the 12th to the 20th century, mostly in liturgy.

4. Ss. Cyril and Methodius University of Skopje
The Saints Cyril and Methodius University of Skopje is the largest university in
the Republic of Macedonia. It was named after the Byzantine Christian
theologians and Christian missionaries Cyril and Methodius, originated
from Thessalonica, and considered as the 'apostles of the Slavs', enlighteners who
developed the precursors to the Cyrillic script used today in most Slavic languages. More
than 50,000 students study at the Skopje University, including some 700 foreign
students. Furthermore, the teaching and research staff number 2,390 people; this is
further supported by over 300 members in the university's institutions.The primary
language of instruction is Macedonian, but there are a number of courses which are
carried out in English, German, French, Italian and minority languages.
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7. SS. Cyril and Methodius National Library
The SS. Cyril and Methodius National Library is the national
library of Bulgaria, situated in the capital city of Sofia. Founded on 4 April 1878,
the library received the status of Bulgarian National Library three years later
and the Bulgarian National Revival Archive was merged into it in 1924.It is
named after "SS. Cyril and Methodius"; Saints Cyril and Methodius. They are
the creators of the Glagolitic alphabet. The Cyrillic alphabet is named after
Cyril.The present building of the library is among the landmarks of Sofia. It was
designed by the famous Bulgarian architectural team Vasilyov-Dimitur
Tsolov and completed in the period 1940-1953.