Ezekiel Landau
Ezekiel (Yeḥezkel) Landau was born in Opatów (Apt), Poland, and was part of the kabbalistic kloyz in Brody. In 1745, he became the chief rabbi and head of yeshiva in Jampol, Poland. Landau was appointed chief rabbi of Prague in 1754, a position he held until his death. In this public role, he contributed to political decisions concerning education and military service. Landau is most revered for his halakhic scholarship, particularly his Noda bi-Yehudah (1776; 1811), a two-volume collection of more than 850 responsa; he became known by the title of that work.