In the book The Last Generations by Ben-Zion Eisenstadt, Brooklyn, 1937, part A, page 84 of the original, the text mentions
...Yitzkhak Aharon - son of Yosef Shimon Zilberfarb - Head of Rabbinical Court in Visoki Litovsk near Brisk in Polin taking the place of his father-in-law Shamai HaCohen Tzirkel, brother of the great gaon Yehuda Meshil Tzirkel..
| Notes: Title in Hebrew: דורות האחרונים Gaon: honored sage, or: genius, referring to a particularly accomplished rabbi-scholar. |
