When Yvonne and Elizabeth, daughters of ruthless Simon Lovage, Earl of Cassio, are born under the same star to different mothers, no one could have foretold their lives would be irrevocably entangled. Against the background of Edward II's turbulent reign in the thirteenth century, Yvonne, Lady of Cassio, contains imaginary and historical characters. It is said the past is a foreign country in which things were done differently. Nevertheless, although that is true of attitudes, such as those towards women and children, our ancestors were also prompted by ambition, anger, greed, jealousy, humanity, duty, loyalty, unselfishness and love. From early childhood, despite those who love her and want to protect her, Yvonne is forced to face difficult economic, personal and political circumstances, during a long, often bitter struggle.