Rabbi Yishmael ben Elisha Nachmani (Hebrew: רבי ישמעאל בן אלישע), often known as Rabbi Yishmael and sometimes given the title "Ba'al HaBaraita" (Hebrew: בעל הברייתא, “Master of the Outside Teaching”), was a rabbi of the 1st and 2nd centuries (third generation of tannaim) CE. Source: Wikipedia (en)