High Quality Content by WIKIPEDIA articles! Mordechai Rokeach (1902 – 17 November 1949), also known as Mordechai of Bilgoray, was a scion of the Belzer Hasidic dynasty and the right hand man to his half-brother, Rebbe Aharon of Belz, the fourth Belzer Rebbe. He was the son (by the second marriage) of the third Belzer Rebbe, Rebbe Yissachar Dov Rokeach (I). His only son, Yissachar Dov Rokeach (II), is the fifth and current Belzer Rebbe.