Jacobi was born in
Jacobshagen,
Kingdom of Prussia (now
Poland), the son of the merchant Mayer Jacobi and his wife Sara-Miriam (née Goldberg). His father died when he was ten years old, and his maternal grandfather Rabbi Jacob Moses Goldberg and uncle Rabbi Nachman Abraham Goldberg were his religious instructors. He attended the Kölnische Gymnasium school in
Berlin. A member of the Modern Orthodox Jewish congregation in
Berlin, Jacobi was a student of Rabbi
Azriel Hildesheimer and Rabbi Elchanan Rosenstein who ordained him. He studied
Semitic languages,
Hebrew and
Theology, in the universities of
Berlin and
Halle, Saxony-Anhalt (
Ph.D. 1865, his
dissertation being "De loco feminarum apud Iudaeos antiuissimos maxime matrimonii contrahendi ratione habita" – "The Role of
Women in Judaism"). Jacobi married Hulda Pander and had seven children. In 1867 he became
Chief Rabbi of
Zagreb,
Croatia. Jacobi established and headed, in Zagreb, the Jewish elementary school (
Talmud Torah), taught
Jewish Studies in high-schools, taught
Hebrew and
Judaism and established Jewish-Women organizations. He was also active in social welfare projects for the Jewish and General Population in Yugoslavia, for which he was highly respected by the general population and the leaders of other religious denominations. In 1885 Jacobi delivered the first Synagogue-Sermon in the Croat language thus encouraging the integration of Jews into the general population; he also wrote the first ever Jewish-Studies text-books in
Croatian. Jacobi's children: his son Dr. Ivan (Hans, Johanan), his daughters Luise Zaloscer and Klara (Loja) Barmaper and his son-in-law Dr. Hugo Spitzer were among the prominent leaders of the Jewish community and
Zionist Movement in Croatia. Jacobi died in Zagreb and was buried at the
Mirogoj Cemetery. ==Writings==