EN
The purpose of this article is to analyze the issue of the admissibility of the designation of an heir by reference to sources other than a last will. The provisions in the fourth book of the Civil Code expressis verbisdo not allow such a possibility, and this issue has not yet met with significant interest in the literature. The author presents regulations concerning the establishment of an heir and interpretation of a last will. Contradictory views on the admissibility of such a testamentary disposition are contrasted, especially in the context of the scope of freedom of testation. At the end of the article, the author expresses his own position on the background of the presented argumentation.