Moshe ben Yitzchak Yehudah Lima was a Polish/Lithuanian rabbi and posek. He learned in Cracow and served as rabbi in Slonim before moving to Vilna and, at the end of his life, to Brisk. The Shach was a member of the beit din over which he presided. His work, Chelkat Mechokek, is one of the basic commentaries to Shulchan Aruch Even HaEzer.
Works on Sefaria
A