An Anglo-Saxon charter of 849 describes an area of Cofton Hackett in the Lickey Hills south of Birmingham as the boundary of the Tomsæte and the Pencersæte, and another charter of 835 describes Humberht as Princeps of the Tomsæte, suggesting that the group retained its identity long after being subsumed into Mercia. The said boundary between Tomsæte and the Pencersæte often had Late Iron Age hill forts that also served as collecting points for territorial produce. As part of Mercia, the Tomsaete was considered an important early group that settled in the heartland.