Yahrtzeit of Rabbi Yechiel Michel Epstein (1829-1907), often called the Aruch HaShulchan, after his main work of Jewish law. He was a prominent Jewish leader in Lithuania, serving as the rabbi of Novordok for nearly four decades. He was the brother-in-law (and later, father-in-law) of the famed Rabbi Naftali Tzvi Yehuda Berlin (the Netziv), and was the father of Rabbi Baruch Epstein, author of the Torah Temimah.