Princess Serena (プリンセス・セレニティ Purinsesu Sereniti?, often referred to as Princess Serenity) is the previous life of the reincarnated Serena Tsukino. Princess Serenity is the daughter of Queen Serenity, ruler of the Moon Kingdom that once resided on the Moon.
Princess of the Moon
Born 1,000 years ago on the Moon, Princess Serena was the beautiful daughter of Queen Serenity, current sovereign of the Moon Kingdom during the Silver Millennium. She was in love with Prince Darien of Earth. Princess Serena was considered to be graceful and excelled in all things, such as figure skating, dancing and basic table etiquette.
At the height of the Moon Kingdom, the Negaverse invaded the kingdom, bringing about the end of the Silver Millennium. During the war, Queen Beryl killed Princess Serena and Prince Darien. Heartbroken over losing her daughter, Queen Serenity used the Imperium Silver Crystal in conjunction with the Crescent Moon Wand to seal the Queen Beryl and the Negaforce away.
However, knowing that the negative forces would eventually break free, she instructed Luna and Artemis to find the Sailor Scouts when the Negaverse was awakened. Using the last of her life force, Queen Serenity then sent all of the subjects of the Moon Kingdom to be reborn in future and died shortly thereafter. However, her spirit continues to guide her daughter and come to her aid whenever needed.