Premise: Margaret of Valois . A daughter of King Henry II of France and Catherine de ' Medici , Margaret was the sister of kings Francis II , Charles IX and Henry III , and of Elisabeth of Valois Queen of Spain , as well as Claude of Valois . In 1589 , after all her brothers had died leaving no sons , Margaret 's husband , the senior-most agnatic heir to France ( the `` Prince du sang '' ) , succeeded to the French throne as Henry IV , the first Bourbon King of France . 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 had brothers.
Label: ENTAILMENT