The Hafla'ah

R. Pinchas HaLevi Horowitz (1731-1805), the Hafla'ah, was Av Beit Din of Frankfurt am Main from 1772 until his death and one of the most original Acharonim of the late-18th century. Brother of R. Shmelke of Nikolsburg and a close talmid of the Maggid of Mezeritch, he was among the first major mitnaged-aligned posekim to adopt Chasidic prayer-rite (Nusach Sefard) in his Frankfurt congregation. His Hafla'ah (on Tractate Ketubot) and Sefer HaMakneh (on Tractate Kiddushin) are foundational yeshiva texts; his Panim Yafot Torah commentary is widely studied. His talmid R. Moshe Sofer (the Chasam Sofer) succeeded him as the leading Hungarian Acharon.