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

Aziru is an historical figure, who is first seen in the novel as a white-skinned, black-haired young man in need of Sinuhe's dental skills.

Keftiu, was Sinuhe's plump Cretan slave, who attracted the attention of the King of Amurru, who fell in love with her. Kaptah bought Keftiu to raise Sinuhe's spirits, but she drove Sinuhe crazy, so Aziru took Keftiu home to be his wife, vowing eternal friendship.