What is the name of the king who ruled in the South West of England, and became the ruler of Mercia upon the death of his sister?
Winchcombeshire: Winchcombeshire was an ancient county in the South West of England, in the Anglo-Saxon period, with Winchcombe as its county town. Winchcombeshire:  The county originated in the shiring of Mercia in the tenth or early eleventh centuries, perhaps by King Edward the Elder in the early 920s. Edward the Elder: Edward the Elder (Old English: "Eadweard cyning "; c. 874 – 17 July 924) was King of the Anglo-Saxons from 899 until his death. Edward the Elder:  He captured the eastern Midlands and East Anglia from the Danes in 917 and became ruler of Mercia in 918 upon the death of Æthelflæd, his sister.
Edward the Elder