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Also, *Rema*, רמ"א . Rabbi Moshe Isserles (1520 – 1572), was arguably the most influential Ashkenzic *posek* who, amongst other works, authored an authoritative commentary on Rabbi Yosef Karo's Shulchan Aruch

Also, Rema, רמ"א . Rabbi Moshe Isserles (1520 – 1572), was arguably the most influential Ashkenzic posek who, amongst other works, authored an authoritative commentary (entitled "The Mappah") on Rabbi Yosef Karo's Shulchan Aruch. Lived in Krakow, Poland and died on Lag BaOmer.

See http://en.wikipedia.org/wiki/Moses_Isserles

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