The article deals with the MS 104 manuscript which lies in the Archive of the Cathedral Chapter at the Wawel. This code was written down in the first half of the 15th century. It appeared a few times in scientific literature, but no detailed study has been devoted to it yet. The manuscript is in a fairly good shape. Notwithstanding, it cannot be made available to anyone since its upper cover is cracked in some places. In the first part of the article emphasis was put on a codicological description of the manuscript in question. The MS 104 code is far from being richly embellished. What it presents externally is an initial, two images of Dowlin’s coat of arms as well as letters’ fillings which resemble human faces which in turn appear but in the first author’s texts. Watermarks and texts handwritten by one person have been accentuated there. The manuscript is not homogenous – what it contains is a collection of ten texts stemming from different authors. There is no certainty as to which person the code might have been dedicated to. The multifaceted character of works included in the code may merely reflect hobbies and interests of the purchaser. Taking account of the time in which the manuscript might have been elaborated as well as what its contents are, the authors of the article decided to focus on two persons – brothers Wincenty and Jakub Kot.