Presenting for the first time to an English-speaking audience a vivid biography of the holy and action-filled life, and the ethical will, of one of the greatest sages and kabbalists, Rabbi Naftali HaKohen Katz (c. 5409 (c. 1648) - 5479 (1719)), of righteous memory.

Rabbi Naftali served as av bet din and reish metivta of Ostroh (Ukraine), Posen (Poland) and Frankfurt am Main (Germany), and was accepted to serve as nasi in Israel in the congregation of Safed. He was also appointed as head of the Va'ad Arba Aratzot (the Council of the Four Lands).

The work is embodied in two volumes enclosed by an elegant slipcase.

Rabbi Naftali's biography (in volume 1) provides the reader with a sense of European Jewish life in the late 17th century and the beginning of the 18th century, and its interaction with the non-Jewish world. Among the material covered is Rav Naftali's kidnapping by the Tatars; the great fire of Frankfurt in 1711, for which Rabbi Naftali was imprisoned; his battle against the charlatan Nehemiah Hiyya Hayyon that had ripple effects throughout the Jewish world; and many other fascinating stories about Rabbi Naftali that indicate his greatness and ability to perform miracles.

Rabbi Naftali's ethical will for his children and family members is a classic. It is filled with essential moral and ethical teachings. Over the centuries, his will has endeared itself to Jewish communities throughout the world and has been reprinted many times in Hebrew and (partially) translated into Yiddish. Volume 2 of the work contains the first translation into English of the entire will, accompanied by extensive annotation. In addition, for the first time the original Hebrew is presented with full vowelization.

Rabbi Naftali's grandson, Rabbi Shimshon Katz, wrote: "This will is a way of life, reproving discipline, words that break the heart of man and arouse him to repentance" and "whoever fulfills [the words of this will] is assured that he will be destined for the World to Come."