Ancient DNA and the Spread of Slavs in Europe: Chronological and Linguistic Dilemmas

On September 3, 2025, Nature published a study by J. Gretzinger, J. Krause, and colleagues titled Ancient DNA connects large-scale migration with the spread of Slavs. The authors claim to have identified genetic signatures of a large-scale population movement in Central and Eastern Europe, which they interpret as the early medieval Slavic expansion dated to the 6th–8th centuries CE. However, ancient DNA analysis itself cannot directly determine chronological boundaries and relies on radiocarbon dating, archaeological context, and historical sources - all of which contain interpretive assumptions. This raises the question of whether the observed genetic patterns might correspond to later historical events, such as the so-called “Slavic conquest of Europe” during the 13th–14th centuries, traditionally known as the Tatar-Mongol invasion. The article explores the methodological dilemma of linking genetics with historical chronology and its implications for the long-debated Slavic-Germanic relationship. Two competing interpretations lead to a “linguistic zugzwang”: either early dating requires explaining the near-complete disappearance of a once-dominant Slavic linguistic landscape, or late dating implies that modern Germanic languages are relatively recent constructs. In both scenarios, the role of Slavs in shaping medieval Europe must be fundamentally reassessed. Ancient DNA thus emerges not only as a tool of historical inquiry but also as a catalyst for rethinking established historical narratives.