The theory of Indo-Europeanization of the continent can be seen as a focal point in all Marija Gimbutas’s work and in her role in the history of archaeology. This theory has combined various directions of her interests and revealed the theoretical and methodological foundations of her research. This paper recalls the theory itself and its development, as well as its importance for European archaeology. The vicissitudes of this theory, which can be metaphorically described as the triad: reception – rejection – revitalization, illustrate the transformations of archaeology in the second half of the 20th century and in the first decades of the 21st century.