The aim of this thesis is to investigate the way R. Baretić establishes the fictitious oral tradition of Trećić in the novel The Eighth Commissioner. Siniša Mesnjak is the eighth government commissioner who went to the furthest Croatian island called Trećić with the task of establishing a local government and enforcing the laws of the Croatian Republic, which are not present on that island. In the novel, Baretić creates a new world, invents a new island, and thus a tradition that rests on the elements of well-known real-life traditions but is shaped differently. The eighth commissioner is a witness to a culture without newspapers, television, technology and communication with the outside world. Therefore, in such a place, spoken word has a much greater meaning than it does in a world that has media and technologies. Tonino Smeraldić is a translator of the trećićanski dialect who tells the commissioner numerous stories from the natives, which constructs his character as a kind of narrator. On Trećić, the inhabitants believe in spells, the customs of the community are described throughout the year, they believe in the supernatural powers of an Aboriginal woman and everyday events seem to confirm these beliefs. The reader gets to know that community with Siniša, and Siniša, from the position of an observer who is outside the community, become a part of the community and begins to tell stories himself and occasionally writes down his experiences in notes on his laptop. Therefore he becomes a witness to a culture and tradition and he becomes an insider researcher in the community who spontaneously tells him their stories. There are different oral genres in the novel, so the ways of intertextual and intermedial connections that are realized by these genres will be explored alongside the fictitious tradition from a folkloristic and cultural-anthropological perspective.