Who is Hrihor from Sinuhe the Egyptian: A Novel and what is their importance?

Hrihor is a high ranking priest of Ammon. He takes Sinuhe deep underground to demonstrate the outlawed god's increased power under persecution by healing three certified invalids. Hrihor entrusts Sinuhe with a potion to kill Pharaoh painlessly and undetectably, which Sinuhe eventually uses.