Hui-kuo

thumb|Painting of Huiguo with an attendant. Japan, Kamakura period (14th century). Huiguo () (746–805) was a Buddhist monk of Tang China who studied and taught Chinese Esoteric Buddhism, a Vajrayana tradition recently imported from India. Later Huiguo would become the teacher of Kūkai, founder of Shingon Buddhism, a prominent school of Buddhism in Japan.

==Biography== Huiguo was one of two Buddhist masters at Ximing Temple, the other being the Indian monk Prajñā. Huiguo began his study of Buddhism as a śrāmaṇera at age 9 under a senior disciple of Amoghavajra, a monk of the tantric tradition, eventually becoming a direct disciple. By age 22 in 766 CE, Huiguo was ordained as a monk and extensively studied the Womb Realm and Diamond Realm mandalas before being fully initiated into Vajrayana that same year by Amoghavajra.