Rabbi Zvi Hirsch Ashkenazi (Chacham Tzvi)

Zvi Ashkenazi (c. 1656–1718), known as Ḥakham Zvi, was a leading Ashkenazi halakhic authority of the early modern period. Born in Moravia, he served as rabbi in Altona-Hamburg-Wandsbeck and later in Amsterdam, where he became one of European Jewry's most respected decisors. He was known for his sharp analytical mind, independence of judgment, and willingness to challenge prevailing customs when he believed halakha demanded it. His responsa collection, Ḥakham Zvi, became a standard reference work. He was the grandfather of the Vilna Gaon and a formative influence on eighteenth-century Ashkenazi scholarship.