The late Venerable Ledi Sayadaw was a highly developed and respected monk in Burma, both in pariyatti (intellectual/ scriptural knowledge) and in patipatti (practice/ meditation). He lived from 1846 to 1923.
He is also known as the first monk in Burma to teach Vipassana meditation to lay persons (people who are not monks). One of his leading students was a lay farmer Saya Thetgyi, who the Sayadaw instructed to also teach others. One of his students was Sayagyi U Ba Khin, the great lay teacher of S.N. Goenka.