Mother Rittah lived in Billibotton, an area of the Dahl sector on Trantor, during the time Hari Seldon and Dors Venabili visited during The Flight. Regarded as a sort of mystic or fortune teller, she spoke of an immortal robot named Da-Nee who helped Ba-lee start the settlement of the galaxy. Da-nee was of course R. Daneel Olivaw, and Ba-lee was Elijah Baley from the Robot series.
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