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R. Jacob Landau (1834–1894) was raised by his father R. Abraham of Tsekhanov ("Czechanower "; 1789–1875), hasidic zaddik of Poland. His family name was originally Dobrzinsky but when R. Abraham married the daughter of Dan Landau, the parnas of Polock (Polotsk), who supported him for many years, he changed it to Landau. R. Jacob was a pupil of R. Menahem Mendel of Kotsk and R. Isaac Meir of Gur.