Caudicus has worked for the Maer for more than a dozen years and is described as thin, with a long nose and curling black hair. He is a full arcanist and considers himself a bit of a historian. He is well traveled and is often hosted by the noble families of Vintas.
In The Chronicle
Kvothe meets Caudicus while working for the Maer. Kvothe observes Caudicus brew the Maer's remedies on an errand to retrieve them, his knowledge of both medicine and alchemy from the University allows him to uncover that Caudicus has been slowly poisoning the Maer with a mixture of lead and denner resin. Although the Maer is sceptical, Kvothe eventually proves his suspicions by dosing Sipquicks with the medicine resulting in their deaths. Following this revelation, Caudicus flees the Maer's estate killing several of his personal guard and escaping for a time. Eventually he is killed by the Maer's guard, Dagon, though it costs him an eye. Caudicus' reasoning for poisoning the Maer is never revealed.
It is during Kvothe's visits with Caudicus that he learns of the Lackless Door.
Many fans speculate that Caudicus was possibly a member of the Order Amyr. It has also been theorized that he was an assassin from the Jakis family, who are known to be vying for the throne and have possible connections to the death of the Surthen family out at sea.
Many also question whether or not Caudicus is truly dead.