ENDuring the 1550s, humanists at the University of Wittenberg in Germany first suggested that Wallachians from present-day Romania had migrated to the Baltic Sea, settled in Livonia and became the ancestors of Estonians and Latvians. This colonization allegedly took place at some time in the 5th or 6th century AD. Although such a theory seems bizarre from a modern point of view, it was considered a perfectly reasonable hypothesis by contemporary scholars. For approximately 150 years, up to the early 18th century, the idea of a Wallachian colonization of Livonia retained its place in the historiography of the region, before it was refuted by the more sober-minded approach of enlightenment historians. The paper provides an overview of the scholarly theories on a kinship between Wallachians, Estonians and Latvians that were formulated between 1550 and 1700. Although these fanciful hypotheses are not supported by any discernible historical facts, they provide important insights on the position of Wallachia and Livonia in the symbolic geography and the mental maps of the early modern res publica litterarum. Keywords: Livonia, Wallachia, migration, genealogy, mental maps, early modern historiography. [From the publication]