A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Author: Toral Delvar
Old Cully is a high ranking Darkfriend who leads a circle in Ebou Dar. He is a gnarled beggar, with straggly hair, one eye and no teeth and rarely bathes. He is ranked higher than Carridin and Mili Skane, though his circle is placed under Caridin's command (ACoS, Ch. 15). Carridin involves him in the search for Mat and he sends his circle after him, dressed as beggars (ACoS, Ch. 29).
“Had circumstances been different, Carridin himself would have knelt to Old Cully, the only name the stinking villain admitted to” (Carridin; A Crown of Swords, Chapter 15).