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Wulfhere (died 675) was King of Mercia from the end of the 650s until 675. He was the first Christian king of all of Mercia, though it is not known when or how he was converted. His accession marked the end of Oswiu of Northumbria's overlordship of southern England, and Wulfhere extended his influence over much of that region. His campaigns against the West Saxons led to Mercian supremacy over much of the Thames valley. He conquered the Isle of Wight and the Meon valley and gave them to King Æthelwealh of the South Saxons. He married Eormenhild, the daughter of King Eorcenberht of Kent. He was effectively the overlord of Britain south of the Humber from the early 660s, although not overlord of Northumbria as his father had been. In 674, he challenged Oswiu's son Ecgfrith of Northumbria, but was defeated. He died, probably of disease, in 675.