High Quality Content by WIKIPEDIA articles! Rabbi Shmuel Dovid Ungar (23 November 1886?21 February 1945), also known as Rabbi Samuel David Ungar, was the rabbi of the Slovakian town of Nitra and dean of the last surviving yeshiva in occupied Europe during World War II. He was the father-in-law of Rabbi Chaim Michael Dov Weissmandl, who relied on his guidance to contrive many schemes to rescue Slovakian Jewry from the Nazis. Ungar was born in Pie??any, Slovakia, where his father, Rabbi Yosef Moshe Ungar, was rabbi of the town. His father died when he was still a young child, and he became a frequent guest at the home of Rabbi Kalman Weber, who was appointed Rav of Pie??any in his father's place. After his bar mitzvah, Shmuel Dovid left home to study at the Preshov Yeshiva headed by his uncle, Rabbi Noach Baruch Fisher. Later, he studied at the Unsdorf Yeshiva. His uncle was so impressed with his comportment and his devotion to prayer that he took him as a son-in-law for his daughter, Miriam Leah.