Mordecai ben Avraham Yoffe (or Jaffe or Joffe) (c. 1530 – 7 March 1612; Hebrew: מרדכי בן אברהם יפה) was a Rabbi, Rosh yeshiva and posek.
He is best known as author of Levush Malkhus, a ten-volume codification of Jewish law that particularly stressed the customs of the Jews of Eastern Europe.
Yoffe was born in Prague; he could count amongst his ancestors Rashi and before him Hillel, Elnathan (governor of Judea) and ultimately back to King David.
'Robes of Royalty' is a work of practical halacha, accompanied by the reasons behind the various halachic decisions according to logic and earlier sources, and includes sections on Torah commentary, philosophy, and mysticism.
While still in his youth, Rabbi Yoffe had the idea to compile a book on Jewish law, which would be used for making halachic decisions.
When R' Moshe Isserles' gloss to the Shulḥan Arukh (called Mappah) appeared in Cracow in 1578, Rabbi Yoffe felt that Rabbi Isserles had been too brief as had Rav Yosef Caro in the Shulḥan Arukh, and decided to resume his original work, "that will be midway between the two extremes: the lengthy Beit Yosef of Caro on the one hand, and on the other Rav Yosef Caro's Shulḥan Arukh together with the Mappah of Rabbi Isserles, which is too brief.
Rabbi Yoffe collectively termed the last three, "rabbinic robes," considering that these should be learned by "every student in that order – philosophy, astronomy, and Kabbalah.