Catalina of Aragon, a Spanish princess, is set to wed Arthur Tudor, eldest son on King Henry VII. Shortly after they wed, Arthur is taken by illness. Catalina then catches the eye of Arthur's brother, Henry. When Henry VII dies, he tells his son Henry that he must marry Catalina. Henry becomes the King of England and marries Catalina. Being loved by her new subjects, Catalina changes her name to the English version, Catherine. After many years, she is still loved by her subjects, but it's a different story with her husband. (thetvdb.com)