1565-1630 (11 Nisan, 5391) ISAIAH BEN ABRAHAM HA-LEVI HOROWITZ (SheLah Hakadosh) (Prague, Bohemia-Tiberias, Eretz Israel) Rabbi, kabbalist, and Jewish leader known as the SheLah Hakadosh for his major work “Shnai Luchot Habrit” (Two Tablets of the Covenant) which combines Halachah and Kabbalah as a way of life.
He moved to Eretz Israel in 1621 after the death of his wife. In 1625 he was arrested with many other Rabbis and held for ransom. The SheLah served as leader and Ashkenazi Rabbi in Jerusalem. He used his personal wealth to financially support the community. The SheLaH strongly believed that he was privileged to be able to observe the commandments tied to the land of Israel. He is buried next to the Rambam in Tiberias.
Many observe the practice of saying this T’filla (link includes English translation) for their children. Some couple this practice with fasting on Erev Rosh Chodesh Sivan.