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Ledi Sayadaw U Ñanadhaja was an influential Theravada Buddhist monk. He was recognized from a young age as being developed in both the theory and practice of Buddhism and so was revered as being both scholarly and saintly. He wrote many books on Dhamma in Burmese and these were accessible even to a serious lay person, hence he was responsible for spreading Dhamma to all levels of society and reviving the traditional practice of vipassana meditation, making it more available for renunciates and lay people alike.
Ledi Sayadaw learned the technique of Vipassana which had remained being taught in the caves of the Sagaing Hills, which was honeycombed with meditation caves and dotted with forest monasteries. It is just as likely that prior to the eighteenth century in Burma, as elsewhere in the Theravāda world, it was generally believed that it was no longer possible to attain enlightenment and hence nibbāna through vipassanā or any other means during the present age.
Ledi's lineage comes from this line, whereby his main teacher was King Mindon’s royal minister U Hpo Hlaing (1830–1883), who was notable for his avid interest in western science and eﬀorts to reconcile this new perspective with abhidhamma. This synthetic approach was passed on to his protégé, the scholar-monk, U Nyana, who later became famous as Ledi Sayadaw, arguably the most signiﬁcant promoter of vipassanā in the modern period.
After mastering the Vipassana technique, he began to teach it to others. His vihara (monastery) was in Ledi village near the town of Monywa. There he meditated most of the time and taught the other bhikkhus. Among Ledi's disciples, Theik-cha-daung Sayadaw(1871-1931) and Mohnyin Sayadaw(1872-1964) are well-known. Theik-cha-daung Sayadaw taught the layman Saya Thetgyi, who would go on to receive training from Ledi himself.
In addition to this most important aspect of his teaching, his concise, clear and extensive scholarly work served to clarify the experiential aspect of Dhamma. Many of his works are still available, including in English through the Buddhist Publication Society.