EN
The presented study acquaints the reader with the content of a manuscript collection from the turn of the 17th century deposited in Budapest (Budapest, Országos Széchenyi Könyvtár, shelf mark Quart. Slav. 41). It mainly focuses on the texts preserved there that are connected with the fate of the bishop of the Unity of the Brethren (Unitas fratrum) Jan Augusta († 1572) during his internment at Křivoklát Castle (1548–1564). Augusta’s texts that are new and unknown from elsewhere are presented in more detail. The study is complemented by two documents, directly preceding Augusta’s release from the prison.