He is the author of both of Scanderbeg's letters written in 1450 and 1459, sent to the Republic of Ragusa, found in the Monumenta Serbica, written in Old Serbian.
The South Slavic languages all derive their forms from Old Church Slavonic, with Serbian emerging from Old Serbian (Serbian-Slavonic), which has a literary history from the 10th century.
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It is written in Old Serbian (Old Church Slavonic) with mainly Rascian orthography and some orthographic features connecting it to Zeta and Hum manuscripts and Macedonian antecedents.
With Gornje Podrinje Foča was part of the old Serbian State up to 1376, when it was attached to the Bosnian State under the reign of King Tvrtko.