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In page Eldad ha-Dani:

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Nineteenth-century critics were divided in their opinions concerning Eldad. Simhah Pinsker, Heinrich Grätz, and Adolf Neubauer believed he was a Karaite missionary, allegedly endeavouring to discredit the Talmud through his statement that the four tribes did not know the names of the Tannaim and Amoraim, and that their halakhot were different from those of the Talmud. This opinion was refuted by Moses Schorr and Adolf Jellinek, who observed that Eldad's halakhot contain rules of shechita not accepted by the Karaites. P. F. Frankl regarded Eldad as a mere charlatan whose sayings and doings were not worth attention. Jacob Reifmann denied outright the existence of Eldad,[citation needed] and considered the letters of the community of Kairwan and of Ẓemaḥ ben Ḥayyim of Sura to be forgeries.