Fraa Arsibalt is a character in the Neal Stephenson novel Anathem.
Fraa Arsibalt is an avout in the decenarian math of the Concent of Saunt Edhar. He is described as massive in frame and being overweight. His father is a high status priest of the Bazian faith in the outside world, from whom Arsibalt is estranged, being illegitimate. Arsibalt's self described goal is to find ways to bring together the world of the avout and the deolators.
Arsibalt, Erasmas, Jesry, and Lio compose the team which has to physically move a capstan to wind the Great Clock each day during Provener for the seven years prior to the start of the novel. At Eliger, he joins the Reformed Old Faanians .