There are three parts to this movie, and here is the plot:
Princess Sissi
Sissi [played by Romy Schneider], a beautiful and lively Bavarian princess, meets the young and handsome Austrian King Franz Josef [played by Karel Heinrich] while on vacation in Austria. Josef [Karl-Heinz B?hm], and they fall in love at first sight. The two fall in love at first sight, but the king is already engaged to Sissi's sister, Helen.
Helen has been appointed queen by the tyrannical Queen Mother Sophie, but the King has fallen hopelessly in love with the na?ve Sissi and eventually defies his mother's wishes by declaring her his future queen at a birthday dinner.
The Young Queen
After a solemn royal wedding in Vienna, Sissi begins her life as a queen. The conflict between the headstrong Sissi and the tyrannical Empress Sophie reaches its peak after the birth of Sissi's daughter. Sophie invokes royal tradition to prevent Sissi from raising her daughter, while Franz obeys her mother's wishes.
Sissi returns to her family's home in Bavaria, and Franz follows her, and they reconcile. Back in Austria, they found that Sophie had also changed her mind and agreed to let Sissi raise her daughter. The young king and wife then visit Hungary, where they become King and Queen of Austria-Hungary to the cheers of the Hungarian people.
The Fate of the Queen
Sissi proves that she can not only handle the affairs of state brilliantly, but also manage her relationship with her mother-in-law properly. However, while she and Count Andersen travel to Hungary to appease the nobles who do not originally bow down, Sophie is spreading rumors that Sissi has an unusual relationship with the Count.
Sissi contracts a serious lung disease while traveling. It is only with her mother's help that Sissi recovers. After recovering, she accompanied Franz on a visit to Italy under Austrian rule. Despite the strong opposition of the people there to Austrian rule, Sissi won the hearts of the people there. Thousands of Venetians cheered Sissi at a grand welcome ceremony in St. Mark's Square.
The full name, everyone rarely mentioned, usually called CC on the end. I checked, the full name should be Sissi - Schicksalsjahre einer Kaiserin 吧
Later people use CC to mean princess
呵呵,希望我的回答对你会有所帮助