Before revision: Historical high kings Rulers who have been termed "high king" (by their contemporaries or by modern observers) include: Various rulers of the ancient and early medieval kingdoms in Great Britain and Ireland have been called "High King"; the High King of Ireland (), like the legendary Brian Boru.
After revision: Historical high kings Rulers who have been termed "high king" (by their contemporaries or by modern observers) include: Various rulers of the ancient and early medieval kingdoms in Great Britain and Ireland have been called "High King"; the High King of Ireland (), such as Brian Boru.