Rabbi Yitzchak Luria […Ashkenazi ben Shlomo] (5294-5332 = 1534-1572 c.e.); Yahrtzeit (anniversary of death): 5th of Av. Buried in the Old Cemetery of Tzfat. Commonly known as the Ari, an acronym standing for Elo-hi Rabbi Yitzchak, the
G-dly Rabbi Isaac. No other master or sage ever had this extra letter Aleph, standing for Elo-hi [G-dly], prefaced to his name. This was a sign of what his contemporaries thought of him. Later generations, fearful that this appellation might be misunderstood, said that this Aleph stood for Ashkenazi, indicating that his family had originated in Germany, as indeed it had. But the original meaning is the correct one, and to this day among Kabbalists, Rabbi Yitzchak Luria is only referred to as Rabbenu HaAri, HaAri HaKadosh [the holy Ari] or Arizal [the Ari of blessed memory].