Edward's reign was marked by economic problems and social unrest that, in 1549, erupted into riot and rebellion. In February 1553, at age 15, Edward fell ill. When his sickness was discovered to be terminal, he and his Council drew up a "Devise for the Succession", attempting to prevent the country being returned to Catholicism. Edward named his cousin Lady Jane Grey as his heir and excluded his half-sisters, Mary and Elizabeth. However, this was disputed following Edward's death and Jane was deposed by Mary within 13 days. Mary I reversed Edward's Protestant reforms, which nonetheless became the basis of the Elizabethath.