Isaac Gastfreund

Isaac Gastfreund (c. 1845 - after 1880, Vienna) was a Galician rabbinical scholar.
He was the author of "Toldot Rabbi Akiva", a biography of the "Tanna" Rabbi Akiva (Lemberg, 1871; see "Ha-Shaḥar," ii.399-400), and of the German work "Mohamed nach Talmud und Midrash" (issued in parts, Berlin, 1875; Vienna, 1877–80; see Sprenger in "Z.D.M.G." xxix.654-659).
He also wrote in Hebrew a biography of the Königswarter family entitled "Toledot Bet Königswarter" (Vienna, 1877); "Anshe Shem," biographies of Jonathan Eybeschütz and Solomon Munk (Lyck, 1879); and "Toledot Yellineḳ," a biography of Adolph Jellinek (Brody, 1880).