The paper critically recapitulates the knowledge about the Płock Gospel called the Golden Codex of Pułtusk ( Princes Czartoryski Library MNK 1207 IV), one of the four "golden codices “ from the 11th century, apart from Krakow, preserved in Gniezno (Codex aureus gnesnensis, Archdiocesan Archives Ms 1 A) and Prague (Gospel Books: Cathedrals of St. Vitus and the so-called Visegrad, Knihovna pražské metropolitní kapituly Cim. 3 and XIV A 4). The origins of the group and its internal chronology remain an open question. Referring to the results of historical, codicological and technological research, supplemented with the reflection of an art historian, we make a new attempt to determine the place of the “Golden Code of Pułtusk” in the culture of the early Piast monarchy, at the same time revealing the process of creating a scientific myth of Polish historiography around this important work of the Piast era.