Jhaqo

Jhaqo is an unseen character in Game of Thrones. He is a Dothraki Khal.

Season 1
Jhaqo was the second to declare himself Khal after Drogo's illness.

Season 2
After discovering the severed head of Rakharo inside a bag carried by Rakharo's horse, Ser Jorah Mormont considers either Khal Pono or Jhaqo as the culprits and that Rakharo was killed as a demonstration of contempt for the notion of a female leading a Khalasar.

In the books
In the Song of Ice and Fire novels, Jhaqo is a ko in Khal Drogo's khalassar. After Drogo's fall from his horse and subsequent incapacitacion, Jhaqo is one of the several kos that declares himself Khal and takes a portion of the khalassar as his own. Among those who follow him is Mago, who becomes Jhaqo's bloodrider.