This is a list of the monarchs of the Kingom of England. The first ruler in Britain to adopt the title King of the English (Rex Anglorum in Latin) was Offa of Mercia in 774, though the continuous list of English monarchs traditionally begins with Egbert of Wessex in 829. The English kingdom was not permanently unified until 927, under Athelstan. Wales was annexed in 1536, and England underwent union with Scotland in 1707 to form the Kingdom of Great Britain. Since that date the title King or Queen of England is incorrect, though has remained in wide usage to the present day.