Królowa matka – szara eminencja by Barbara Obtułowicz

“…At first, she used the fact that her three year old daughter, Queen Isabella II, was queen regnant of Spain for this purpose. After Isabella’s coming of age, her mother became the grey eminence. …”
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Sir Henry Unton, Elizabeth I and Chivalric Diplomacy by Sowerby, T

“…Elizabeth I may not have been England’s first queen regnant, but it was in her reign that the full implications of female monarchy were felt in English diplomacy. …”