The History of the Zora, Part Five is a Monument, and a location you need to visit for the quest Zora Stone Monuments.
The Sage Princess Ruto As told by King Dorephan
Long, long ago... In a past more distant than even the Great Calamity, or the creation of the Divine Beast Vah Ruta... There was Zora princess named Ruto. We know that was an attendant to the Zora patron deity and that she was a fair and lively girl, beloved to all. Around that same time, an evil man with designs on ruling the world appeared, bringing disaster upon Zora's Domain. It is said that Ruto then awoke as a sage, facing this foe alongside the princess of Hyrule and the hero of legend. Her achievements are remembered not only by the Zora, they are also forever etched into the history of Hyrule. The Divine Beast Vah Ruta, built ages later to face off against Calamity Ganon, was named in honor of Ruto. That the Zora princess - my sweet daughter Mipha - was chosen to pilot Ruta is surely the work of fate.