ABSTRACT The article offers a detailed analysis of the Latin text of the Breviarium , chapters 1-7, in the Schwartz-edition. The list of content, inserted directly befor the Breviarium in the collectio Sangermanensis cannot be affirmed as authentic (but it seems to be elder than the collectio Sangermanensis ). The title and the prooemium offer short hints to person and work of Liberatus. The use of sources in the following chapters offers serious problems and cannot be described as a coherent, consequent method. Liberatus uses the Historia tripartita sometimes verbally, sometimes only summarizing it. Sometimes he inserts even further informations of unknown origin. And he knows an alia lectio of the Historia tripartita , presumably an otherwise unknown version of Socrates' Historia ecclesiastica . For Apollinaris he offers an interesting image of his heresy, but for Paul of Samosata he simply uses the polemical strategy started by Eusebius of Dorylaeum and Caelestinus of Rome against Nestorius. The inthronisation of Maximinus is located on a wrong chronological place by Liberatus, so Liberatus is not always sure in his understanding of the complexe processes of the early 5 th century.