Bitola triodion

The Bitola Triodion is a Middle Bulgarian Glagolitic manuscript that contains a triodion from the late 12th century.

History
In 1898, the manuscript was brought to the Bulgarian Trade Agency in Bitola from a nearby village, along with other Slavic and Greek manuscripts. Historian Yordan Ivanov found it in Bitola in 1907. It is now kept in the library of the Bulgarian Academy of Sciences in Sofia.

Description
The triodion contains 101 leaves of parchment, each sized to 27.5 x 19.5 cm. According to Ivanov, it was written in the village of Световраче by Georgi Gramatik. Along with usual service prayers, it contains a hymographic cycle of Konstantin of Preslav. It is written in Cyrillic with traces of Glagolitic, which is considered to be a characteristic feature of manuscripts from the Bulgarian region.

Some scholars assume that it is a direct copy of an older, Glagolitic book. The document contains musical notation, and a frequent use of the Θ|self-theta (Θ), which is written in black and red ink. The sign is placed above individual words to inform singers of musical ornamentation.