Rabbeinu Yerucham HaShalem : Sefer Meisharim (Vol. 5)

Rabbi Yerucham ben Meshulam (1290-1350), was a prominent rabbi and posek during the period of the Rishonim.
Various components of halacha, as ruled by Rabbenu Yerucham, have been codified in the Shulchan Aruch in the name of Rabbeinu Yerucham. He greatly influenced Rabbi Yosef Karo. He is quoted extensively by Rav Karo in both the Shulchan Aruch as well as the Bet Yosef on the Tur.