ספר מגלה עמוקות

Rabbi Natan Nata Shapira of Krakow (born in 1584 – July 20, 1633, 13th of Av 5393) was one of the rabbis of Poland and among the most prominent Kabbalists of his time. He is known by the title of his book Megaleh Amukot (Revealer of Depths).