|Book(s)|| A Game of Thrones (mentioned)|
A Clash of Kings (mentioned)
A Storm of Swords (appears)
A Game of Thrones
When his father, Janos Slynt, is named Lord of Harrenhal, Jothos is officially decreed to be among those who shall hold the honors bestowed upon Janos after his death. Two of Janos's sons accompany him to the Iron Throne, but it is unknown whether Jothos is among them.
A Clash of Kings
A Storm of Swords
Jothos is now a squire. Lord Varys warns Tyrion Lannister that Jothos and his brothers would gladly inform on Tyrion to avenge their father. Following the death of King Joffrey I Baratheon at his wedding feast, Jothos testifies at the trial against Tyrion Lannister, stating that he had seen Tyrion gather the poisoned chalice off the floor and poured the remaining contents on the floor.