These two fragments are among the oldest artifacts in the manuscript collections of the Slovak National Library. They are parchment folios, written on both sides, and are of Croatian provenance. It is believed that they came to the territory of Slovakia through the Franciscan friars or by the exchange of codices and printed books among Franciscan libraries or archives. They were discovered at the library of the former Franciscan monastery in Hlohovec in southwestern Slovakia in 1936. The folios contain parts of the Glagolitic service book from the end of the 13th century or early 14th century, and were preserved in the Italian book binding of a copy of Trattato dell'amore di Dio (Treatise on the love of God, Venice, 1642) by Saint Francis de Sales. Old Church Slavonic text is written in Croatian Glagolitic of the older type. The sheets contain the masses De communi apostolorum (Of the community of apostles) and De communi martyrum (Of the community of martyrs). Although there remain no autographs from the period of the Great Moravian Empire (circa 800−circa 900), it is likely that these texts derive from the ninth century, mediated by Glagolitic and Cyrillic transcripts from 11th century and later. The manuscript is decorated only by the scribal initials. Glagolitic refers to the alphabet invented during the ninth century by Saint Cyril and Saint Methodius to translate the Bible and other religious works into the Slavic language spoken in the region of the Great Moravian Empire.