Oswiu of Northumbria
In 655 Penda besieged Oswiu of Northumbria at Iudeu, the location of which is unknown but which may have been Stirling, in Scotland. Penda took Oswiu's son, Ecgfrith, as hostage, and Oswiu paid tribute, in the form of treasure, to secure Penda's departure. On the way back to Mercia, Oswiu overtook Penda and on 15 November 655 Oswiu and Penda fought on the banks of the (unidentified) River Winwaed. Penda was killed and beheaded by Oswiu, who divided Mercia into northern and southern halves. The northern portion was kept under direct Northumbrian control; the southern kingdom was given to Penda's son Peada, who had married Oswiu's daughter Ealhflæd "ca" 653.