Arba'ah Turim (Hebrew: אַרְבַּעָה טוּרִים), often called simply the Tur, is an important Halakhic code, composed by Yaakov ben Asher (Cologne, 1270 - Toledo c.1340, also referred to as "Ba'al ha-Turim", "Author of the Tur"). The four-part structure of the Tur and its division into chapters (simanim) were adopted by the later code Shulchan Aruch.
Read more about Arba'ah Turim: Meaning of The Name, Arrangement and Contents, Later Developments