 In one of these responsa Natronai decides that the followers of the pseudo-Messiah Serenus, should again be received into their community; in the other he decides against the reception of the children of certain heretic Jews who had renounced both Talmudic and the Biblical Judaism.A number of responsa in the compilation "Sha'arei Tzedek" and elsewhere bear the name of Natronai, but it is difficult to decide whether they are the work of Natronai b. Nehemiah or of some other Natronai.This difficulty tripped up, for instance, I.H.