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The Kingdom of Mercia was a state in the English Midlands from the 6th century to the 10th century. For some two hundred years from the mid-7th century onwards it was the dominant member of the Heptarchy and consequently the most powerful of the Anglo-Saxon kingdoms. During this period its rulers became the first English monarchs to assume such wide-ranging titles as King of Britain and King of the English.
Spellings varied widely in this period, even within a single document, and a number of variants exist for the names given below. For example, the sound th was usually represented with the Old English letters ð or þ.
For the Continental predecessors of the Mercians in Angeln, see List of kings of the Angles. For their successors see List of English monarchs.