Premise: Margaret of Valois . A queen of two kingdoms , Margaret was subjected to many political manipulations , including being held prisoner ( albeit at a comfortable castle ) by her own brother , Henry III of France , for many years . While imprisoned , she took advantage of the time to write her memoirs , which included a succession of stories relating to the disputes of her brothers Charles IX and Henry III with her husband .
Hypothesis: Margaret of Valois spent time imprisoned.
Label: ENTAILMENT