name another king of this place.
King Offa
Mercia
 The reign of King Offa, who is best remembered for his Dyke that designated the boundary between Mercia and the Welsh kingdoms, is sometimes known as the "Golden Age of Mercia".
who was wulfhere of mercia? King of Mercia which modern country is it a part of today? UNANSWERABLE
wiki:11585733
Mercia [SEP] Introduction
The reign of King Offa, who is best remembered for his Dyke that designated the boundary between Mercia and the Welsh kingdoms, is sometimes known as the "Golden Age of Mercia". Nicholas Brooks noted that "the Mercians stand out as by far the most successful of the various early Anglo-Saxon peoples until the later ninth century", and some historians, such as Sir Frank Stenton, believe the unification of England south of the Humber estuary was achieved during the reign of Offa.