On March 12, 2024 at 14-00, as part of the meeting of the Department of Typology and Comparative Linguistics, a report was given by Leonid Aleksandrovich Vyazov (University of Ostrava, Czech Republic; Harvard University, USA), Olga Viktorovna Flegontova (University of Ostrava, Czech Republic), Harald Ringbauer (Max Planck Institute for Evolutionary Anthropology, Germany), David Reich (Harvard University, USA), Pavel Nikolaevich Flegontov (University of Ostrava, Czech Republic; Harvard University, USA) "Geography and chronology of the Slavic settlement in Central and Eastern Europe according to archaeogenetic data". The methods based on allele frequencies (principal component analysis, ADMIXTURE and qpAdm), widely used in modern archaeogenetics, have been successfully applied to reconstruct historical processes in the Neolithic and Bronze Ages, but their application to later eras faces major challenges, since genetic variation in these eras is described by continuous gradients rather than by graphs composed of isolated and occasionally intermingling populations. For example, it is very difficult to differentiate historically known Slavic, Germanic and Celtic groups based on archaeogenetic data using these methods. To address this issue, we applied a method based on autosomal haplotypes (IBD-sharing, Ringbauer et al. 2023, bioRxiv). This method allows us to identify the presence of distant kinship between pairs of individuals. These relationships can be represented as a network graph and visualized using various layout algorithms on a plane. The network graph we constructed, which includes more than 2000 individuals from the territory of Northern Eurasia in the 1st millennium BC – 1st millennium AD, showed the presence of several large clusters (highlighted by the Leiden algorithm) corresponding to relatively isolated populations. One of the identified clusters includes individuals of the Roman period and the Great Migration Period from the territories where the Slavic presence is confirmed by historical and archaeological sources. The archaeological context of these burials is different. Most come from the burial grounds of the Avar period, the latest samples (11th-12th centuries) are from the Balkan Peninsula, Hungary and Ancient Rus. The earliest samples date back to the late 2nd – early 3rd century AD and were found in the burials of Viminacium, the Skorenovac burial ground in Vojvodina, in Tanais, and also on the Middle Volga (Komintern-2, Novoslavka-2, Karlinskoye-1). We assume that this cluster reflects the Slavic settlement in the territory of Central and Eastern Europe. Taking into account the results of other analyses based on allele frequencies (PCA, ADMIXTURE), we can propose a hypothesis about the origin of the population of the "Slavic" cluster: it was formed as a result of mixing of a group related to the population of the Baltic in the 1st millennium BC with the Eastern Germans and Sarmatians. We believe that the starting point of the settlement of the described population in Central and Eastern Europe could have been the migrations of the Sarmatian population at the end of the 2nd century AD. The meeting will be held in a mixed format: on the Zoom platform and in person in room 903. Keynote speaker - L.A. Vyazov