What is the setting of The Hollow Hills by Mary Stewart?

The setting of The Hollow Hills is the late 5th and early 6th century in England. At the time, England was at constant war because it was separated into small factions. Uther was the High King, but each area had its own leader. Also, the Saxons were invading from the present-day French and Spanish border, so there was much unrest during Uther’s reign.