Arba'ah Turim (Hebrew: אַרְבָּעָה טוּרִים), often called simply the Tur, is an important Halakhic code composed by Yaakov ben Asher (Cologne, 1270 – Toledo, Spain c. 1340, also referred to as Ba'al Ha-Turim). The four-part structure of the Tur and its division into chapters (simanim) were adopted by the later code Shulchan Aruch. This was the first book to be printed in Southeast Europe and the Near East. Source: Wikipedia (en)