Ah cool, finally figured this out: The Hojo Clan Mon (Mitsuuroko "Three Scales") matches Miyamoto's Triforce symbol. The influential Hojo supported the spread of Zen Buddhism during the Kamakura Shogunate, so no wonder their symbol appears on many temples. #Zelda
Kyoujin-ishi "The Madman Stone" - Legend tells that any who desecrated the area protected by the Shrine and its Kami within would be turned mad upon touching it. (I translated this as "Giant Stone", but I've only got the Romaji to go by).