Elizabeth, like Mary, was the daughter of Henry VIII, although her mother was Anne Boleyn, who is best known for having been beheaded by her dear husband. Like her half-sister, Elizabeth was eventually declared an illegitimate child and removed from and later readded to the line of succession. A Protestant, she'd been placed under house arrest when Mary took the throne and returned England to Catholicism, but she was released by Philip when he thought Mary was pregnant. As soon as Elizabeth became queen in 1558, she returned England to the Protestant rule begun during Edward's reign. While many of her subjects were pleased with this decision, the clash between Catholics and Protestants would continue throughout Elizabeth's tenure, and would eventually lead England to war against Spain. It also led Elizabeth to authorize piracy against the Spanish, sometimes legally under the guise of privateering and sometimes illegally but “unofficially” approved.