Hillel Rivlin
Hillel Rivlin of Shklov was a close disciple of the Vilna Gaon. Along with some other pupils of the Vilna Gaon, he is credited with having revitalized the Ashkenazi community in what is now Israel, by immigrating to Jerusalem in 1809.
He was also the author of the esoteric text known as Kol HaTor, that describes the 999 footsteps of the Messiah's arrival. He is considered one of the patriarchs of the Rivlin family.
