Oswiu, at the Battle of Winwaed.
This kingdom is at the top of a list which was almost certainly produced for one of its kings, the Tribal Hidage. A coin minted in this kingdom strangely bore the words of the Shahada in Arabic, which its silversmiths had copied from a dinar. A ruler of this kingdom dealt with the troublesome bishop Jeanbert by having Lichfield declared an archbishopric by the pope. A leader of this kingdom defeated and dismembered a rival at the Battle of Maserfield, but was then killed by that rival's brother, (*) Oswiu, at the Battle of Winwaed. For three hundred years, this kingdom had hegemony over the lands south of the Humber River. This kingdom's capital at Tamworth was established by a king who also dealt with Welsh raids by constructing his "dyke." For 10 points, name this Anglo-Saxon kingdom that was ruled by Penda and Offa and was located in the Midlands south of Northumbria.
This kingdom is at the top of a list which was almost certainly produced for one of its kings, the Tribal Hidage.
Mercia