Sefer Knesset Yechezkel – Responsa by the gaon Rabbi Yechezkel Katzelelbogen, av beit din of Ah”u (Altona, Hamburg and Wandsbek). Altona, 1732. First edition in the author’s lifetime. Several original supplements in a rabbinic script along the leaves of the book: Page 129a – indices – a short description is added that was omitted in print; page 100b has two handwritten supplements of text in the margins of the responsa with a short description of the contents that were omitted in print; several other places have omissions from the print in several of the questions (questions 45, 72, 73); and next to question 75 is a small handwritten revision. Refer to the Hebrew catalog text for a brief biography of the gaon Rabbi Yechezkel Katzelelbogen . 130 leaf. 34 cm. Fine condition. Small worming perforations in the first leaves. Usage and aging stains. The first group of leaves is detached. Old binding, partially detached.