Wu Yantong (Chinese: 無言通, known in Vietnam as Vô Ngôn Thông, 759?-826 C.E.)
Born into a wealthy family, upon coming of age he renounced that lifestyle for a monastic life and eventually realized satori or enlightenment.
Around 820 C.E., he crossed the border of southern China and arrived at Phù Đổng village to reside in the Kiến Sơ Temple in Bắc Ninh, Northern Vietnam.
There he founded the Vô Ngôn Thông Zen Sect utilizing bích quán or wall-contemplation to realize the ultimate reality of the nature of mind as practiced by the founder of Zen or C'han Buddhism, Bodhidharma, an Indian monk who introduced this form of Buddhism to China around 520 C.E.
You can help Wikipedia by expanding it.This biographical article about a Vietnamese religious figure is a stub.