Baal HaTurim

Rabbi Jacob ben Asher (1269-1343), Spain; Composer of Arba’ah Turim, tracing Halacha from the Torah through Talmud and early Poskim. Many commentaries were written on the Tur, including R’ Yosef Karo’s “Beit Yosef” which formed the basis of the Shulchan Arukh.