Aginah

Aginah is a character from The Legend of Zelda: A Link to the Past. He is a hermit living in a cave in eastern Hyrule. It is he who reveals to Link that the Book of Mudora is needed to enter the Desert Palace. With this knowledge, Link travels to the Kakariko Village Library, and obtains the book. With it in hand, he then travels to the desert, and uses the Book of Mudora to translate the Hylian Writing on the stones blocking the path to the palace Palace. With the writing translated, the stones shift, enabling Link access.

If Link visits Aginah after completing the Desert Palace, the hermit congratulates him and suggests that he must be related to the hero of legend.