Byzantine notation. The literary schools of the first Bulgarian empire Unfortunately, no Slavonic tropologion written in Glagolitic script by Cyril and Methodius has survived. This lack of evidence does not prove that it had not existed, since certain conflicts with Benedictines and other Slavonic missionaries in Great Moravia and Pannonia were obviously about an Orthodox rite translated into Old Church Slavonic and practised already by Methodius and Clement of Ohrid. Only few early Glagolitic sources have been left. The Kiev Missal proves a West Roman influence in the Old Slavonic liturgy for certain territories of Croatia. A later 11th-century New Testament lectionary known as the Codex Assemanius was created by the Ohrid Literary School. A euchologion (ET-MSsc Ms. Slav. 37) was in part compiled for Great Moravia by Cyril, Clement, Naum and Constantine of Preslav. It was probably copied at Preslav about the same time. The aprakos lectionary proves that the Stoudites typikon was obeyed concerning the organisation of reading cycles. It explains, why Svetlana Kujumdžieva assumed that the "church order" mentioned in Methodius' vita meant the mixed Constantinopolitan Sabbaite rite established by the Stoudites. But a later finding by the same author pointed to another direction. In a recent publication she chose "Iliya's book" (RUS-Mda Fond 381, Ms. 131) as the earliest example of an Old Church Slavonic tropologion (around 1100), it has compositions by Cyril of Jerusalem and agrees about 50% with the earliest tropologion of Sinai (ET-MSsc Ms. NE/MΓ 56+5) and it is likewise organised as a mеnaion (beginning with September like the Stoudites), but it still includes the movable cycle. Hence, its organisation is still close to the tropologion and it has compositions not only ascribed to Cosmas and John, but also Stephen the Sabaite, Theophanes the Branded, the Georgian scribe and hymnographer Basil at Mar Saba and Joseph the Hymnographer. Further on, musical notation has been added on some pages which reveal an exchange between Slavic literary schools and scribes of Sinai or Mar Saba: theta ("θ" for "thema" which indicates a melodic figure over certain syllables of the text) or fita notation was used to indicate the melodic structure of an idiomelon/samoglasen in glas 2 "Na yeerdanĭstěi rěcě" (Theophany, f.109r). It was also used on other pages (kanon for hypapante, ff.118v-199r & 123r), two forms of znamennaya notation, an earlier one has dots on the right sight of certain signs (the kanon "Obrazę drevle