About Kento Three Great Acalas

The Kanto Three Great Acalas (関東三大不動) is a collective term, recorded in the Japanese history, for the three temples that are dedicated to the Acala in Kantō region governed by shōgun.
Garbhadhatu (Sanskrit) or Taizo-kai (jp.) - Mandala

Shingon Buddhism – The Japanese root of Esoteric Buddhism

Shingon Buddhism is one of the major schools of Buddhism in Japan and one of the few surviving Vajrayana lineages in East Asia, originally spread from India to China through traveling monks such as and . Known in Chinese as the Tangmi these esoteric teachings would later flourish in Japan under the auspices of a Buddhist monk named (空海), who traveled to Tang China to acquire and request transmission of the esoteric teachings. .