Bidspirit auction | Signed by the Chief Rabbi,

Signed by the Chief Rabbi, Rabbi Avraham Yitzchak Hacohen Kook - Signed by the Chief Rabbi, Rabbi Avraham Yitzchak Hacohen Kook Rabbi Avraham Yitzchak Hacohen Kook (1865-1935) the CHief Rabbi of Eretz Yisrael, a Gaon and Mekubal, the founder of the Merkaz Harav Yeshiva and one of the forefathers of religious Zionism. The author of Sifrei Yesod and Rav of many Gedolei Yisrael.