Rabbi Yaakov (Yakel) Slonik was a 17th-century rabbi and head of the rabbinical court in Pidhaitsi, a small city in what is now western Ukraine. His father, Rabbi Binyamin Aharon Slonik, was a leading disciple of Rabbi Moses Isserlis and Isaac Luria. Slonik’s halakhic ideas appear in his father’s work of responsa, Masat Binyamin, and in Rabbi Yaakov Yehoshua Falk’s Penei Yehoshua responsa. He wrote Nachalat Ya’akov, a supercommentary on Rashi’s Torah commentary.