Collection of the HIDA's letters, many on Kabbalistic subjects. R. Hayyim Yoseph David Azulai (known by his Hebrew acronym HIDA, 1724–1806), halakhist, kabbalist, emissary, and bibliographer. The Hida was born in Jerusalem; he was descended on his father's side from a prominent family of rabbis and kabbalists from Spain while his mother was a daughter of Joseph Bialer who had gone to Erez Israel with R. Judah Hasid in 1770. He studied under some of the outstanding Jewish scholars of his age including R. Jonah Navon, R. Isaac ha-Kohen Rapoport, and R. Hayyim ibn Attar. R. Azulai attained early eminence in Jewish studies and was regarded by the Jewry of the Ottoman Empire and of Italy as the leading scholar of his generation. He was highly esteemed, too, by the Jews of Germany, especially after the publication of his works.