From Teshuvot Hageonim (Shaarei Tzedek 43) Yehoshua tiken Aleinu Leshabeiach velav hu mitakanat Rabanan menucha Eli Turkel wrote: ><< >: In fact malchiyot was composed by Rav and there is no indication that >: he incorporated an earlier prayer from Yeshoshua. > > > >Again there is no early source for such a claim. > >