Despite obtaining her freedom, Margaret decided to stay in the castle of Usson, where she spent eighteen years. Of her life in Usson, there is very little reliable information, so a lot of legends have gathered around it. Here, she learned of her mother's death and of her brother Henry III's assassination in 1589. Her husband, Henry of Navarre, became King of France under the name of Henri IV. He was, however, not accepted by most of the Catholic population until he converted four years later.