Lady Jane Grey
Dudley knew that if either of Edward's half-sisters, Mary or Elizabeth, became queen, he would not be powerful anymore.  Dudley plotted with Jane's equally ambitious parents and planned that Jane became his ward, and also that she marry his son, Guildford Dudley.  Jane's mother decided to give up her claim to be queen for Jane. This did not mean that Frances was any less greedy, however. This meant that Jane would become Frances and Dudley's puppet and do what they wanted. Now Jane would be the next in line to the throne if the rights of the princesses Mary and Elizabeth were ignored.