Kakuban was born in Fujitsu-no-shō (Hizen Province, nowadays part of Kashima City, Saga Prefecture) about three hundred years after Shingon Buddhism was first founded by Kūkai (空海).
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By age 30, he received patronage from the noble families in Kyoto, including Cloistered Emperor Toba's permission to build the Denbō-in (伝法院) on Mt. Koya as a center for studying Buddhism.