Jacob of Lissa

Yaakov ben Yaakov Moshe Lorberbaum of Lissa (1760-1832) (known in English as Jacob ben Jacob Moses of Lissa, Jacob Lorberbaum or Jacob Lisser,Hebrew: יעקב בן יעקב משה מליסא) was a Rabbi and Posek. He is most commonly known as the "Ba'al HaChavas Da'as" or "Ba'al HaNesivos" for his most well-known works, or as the "Lissa Rav" for the city in which he was Chief Rabbi.

Rabbi Lorberbaum was the great-grandson of the Chacham Tzvi, Rabbi Zvi Ashkenazi; he was therefore related to Rabbi Jacob Emden. According to one tradition, his father, Rabbi Yaakov Moshe died before he was born, and his relative, Rabbi Yosef Teomim, the rabbi of Bursztyn, brought him up. This accounts for the common name that both father and son share. Another tradition states that before he was born, his father fell ill, and dreamed that he would recover in the merit of the son that would be born to him. In the merit of his future son, the father took his name-to-be. He studied under Rabbi Meshulam Igra.

He was head of the Beis Din in Kalush, Ukraine. In 1809, he agreed to become the Rav in Lissa (today known as Leszno, Poland), where he enlarged his Yeshiva's enrollment. Hundreds of scholars came to study there in the years of his leadership. Among his students were Rabbi Elijah Gutmacher, Rabbi Shraga Feivel Danziger, who were supporters of their colleague Rabbi Zvi Hirsch Kalischer..

Along with Rabbi Akiva Eiger and Rabbi Akiva Eiger's son-in-law, the Chasam Sofer, Rabbi Lorberbaum vehemently fought against the maskilim, the reformers of the Jewish Enlightenment. In 1822, he left Lissa and returned to Kalish, where he wrote many of his works. He lived there for ten years.

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