Huineng

Dajian Huineng;, also commonly known as the Sixth Patriarch or Sixth Ancestor of Chan, is a semi-legendary but central figure in the early history of Chinese Chan Buddhism. According to tradition he was an uneducated layman who suddenly attained awakening upon hearing the Diamond Sutra. Despite his lack of formal training, he demonstrated his understanding to the fifth patriarch, Daman Hongren, who then supposedly chose Huineng as his true successor instead of his publicly known selection of Yuquan Shenxiu.

Twentieth century scholarship revealed that the story of Huineng's Buddhist career was likely invented by the monk Heze Shenhui, who claimed to be one of Huineng's disciples and was highly critical of Shenxiu's teaching.Huineng is regarded as the founder of the "Sudden Enlightenment" Southern Chan school of Buddhism, which focuses on an immediate and direct attainment of Buddhist enlightenment.

Source: Wikipedia