Moreover, there are several intriguing observations regarding individuals associatedwith the Corded Ware culture, who are the earliest Central and Northern Europeans tocarry high amounts of Steppe-like ancestry. Previous aDNA research has shown them tobe a genetic mix of previous Final Neolithic farmer cultures as well as Steppe-like ancestry[Haak et al., 2015, Allentoft et al., 2015, Papac et al., 2021]. Using IBD, we find that individuals from diverse Corded Ware cultural groups, including from Sweden (associatedwith the Battle Axe culture), Russia (Fatyanovo), and East/Central Europe share highamounts of long IBD with each other, and also have IBD sharing up to 20 cM with various Yamnaya groups (Fig. 5, Fig. E2). Importantly, we find a distinctive IBD signal withthe so-called Globular Amphora culture, in particular from Poland and Ukraine, whowere Copper Age farmers not yet carrying Steppe-like ancestry [Mathieson et al., 2018,Schroeder et al., 2019]. This IBD link to Globular Amphora appears for all Corded Waregroups in our analysis, including from as far away as Scandinavia and Russia (Fig. 5),which indicates that individuals related to Globular Amphora contexts from Eastern Europe must have had a major demographic impact early on in the genetic admixtures giving rise to various Corded Ware groups.