Seven Warring States, the combatants from a turbulent period of Chinese history
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Heptarchy, the precursors to the Kingdom of England in English history
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Broun, Dauvit, “The Seven Kingdoms in De Situ Albanie: A Record of Pictish political geography or imaginary Map of ancient Alba”, in E.J. Cowan & R. Andrew McDonald (eds.), Alba: Celtic Scotland in the Medieval Era, (Edinburgh, 2000, rev. 2005).