The founder of the dynasty was Rabbi Shlomo Hakohen Rabinowicz (the Tiferes Shlomo) (1801-1866), who had begun serving as Rav of Radomsko (Radomsk) in 1834 [REF].
Upon the Rebbe's death in 1866, his youngest son, Avraham Yissachar Dov Hakohen Rabinowicz (1843-1892), succeeded him.