Kasuto

Kasuto is the name of two towns in The Adventure of Link. The original town of Kasuto (Old Kasuto) was attacked and destroyed by monstrous Moas, forcing its people to flee, only leaving behind a single old man. New Kasuto was founded, hidden in the woods in the far east of Hyrule. Its townsfolk guarded the Magical Key as well as a powerful magic spell and valuable magic container.

It is often noted that Kasuto is the only town name in The Adventure of Link that does not have a similarly named character in Ocarina of Time. Why this is, is unknown as anyone of slight importance could have gotten this name (contrary to what most people think, the names of the places in The Adventure of Link are not solely used for Sages, as Mido also was named after a place in The Adventure of Link.)

This, combined with unused data found by hacking the game cartridge, has led to speculation that another sage with the name of Kasuto may have at one point been intended for the game. Some also believe that Kaepora Gaebora was Kasuto since Kaepora is a past sage, and Kasuto isn't a sage mentioned in Ocarina of Time.

There is also a fan fiction author that goes by the name of Kasuto of Kataan, who wrote a series of stories about Link after his adventure in The Legend of Zelda: Ocarina of Time.