Yahrtzeit of Rabbi Yitzchak Elchanan Spector (1817-1896), who served as chief rabbi of Kovno, the most prominent rabbinical position at the height of 19th century Lithuanian Jewry. Rabbi Spector collaborated with many of his contemporaries, including Rabbi Yisrael Salanter and Rabbi Samson Raphael Hirsch. His collection of responsa is entitled, Be'er Yitzhak, and various institutions have been named after him, including the Rabbi Isaac Elchanan Theological Seminary of Yeshiva University.