Years: c. 1650–1712
Primary city: Frankfurt
Rabbi Tzvi Hirsch Kaidanover was a late 17th and early 18th-century author and rabbi in Frankfurt, known for his primary work, Kav HaYashar. He authored this influential book of mussar, an ethical-kabbalistic collection of stories and moral guidance intended to popularize kabbalistic ideas. First published in 1705, Kav HaYashar achieved widespread popularity, appearing in over 80 editions and becoming a staple of Jewish ethical literature.