EN
The former fideicommissum Library of the counts Czernin of Chudenice located in the Czernin Palace in Prague in the Hradčany castle was, after being sold in 1780, incorporated into the Prague Palace Library of the Princes of Lobkowicz and it came together with this library in the holding of the today´s National Library of the Czech Republic. This study is dedicated to the manuscript collectoon held in the Hradčany Palace in about the year 1722 under the rule of count František Josef (1696-1733). The author intends to shed light on the origin of the collection and she presents the most interesting manuscripts preserved; her results are based on the knowledge gained during the preparation of a printed catalogue of the Czernin manuscripts.