Mary's death in 1558 led to her half-sister Elizabeth taking the throne. Unlike Mary, Elizabeth was firmly in the reformist camp and quickly reimplemented many of Edward's reforms. Philip, no longer co-monarch, deemed Elizabeth a heretic and illegitimate ruler of England. In the eyes of the Catholic Church, Henry had never officially divorced Catherine, making Elizabeth illegitimate. It is alleged that Phillip supported plots to have Elizabeth overthrown in favour of her Catholic cousin and heir presumptive, Mary, Queen of Scots. These plans were thwarted when Elizabeth had Mary imprisoned and executed in 1587. Elizabeth retaliated against Philip by supporting the Dutch Revolt against Spain, as well as funding privateers to raid Spanish ships across the Atlantic. She had also negotiated an enduring trade and political alliance with Morocco.