Queen Elizabeth I learned to trust no one. Even before Elizabeth was crowned queen at the age of 25, her mother, Anne Boleyn, had been executed for treason by her father, King Henry VIII. She was then removed from the royal line of succession and later imprisoned in the Tower of London, accused of plotting to overthrow her sister, Queen Mary. Yet despite all the challenges to her power, she became a hero of the Church of England in a century when...