Yat'Yir was the trusted aid of the Jaffa leader Gerak.
Biography
2005
Yat'Yir accompanied Gerak to his first meeting with Major General Henry Landry on Earth. It was hoped that this informal session would open doors for an eventual treaty between Earth and the new Free Jaffa Nation. Yat'Yir does not trust Teal'c, and openly challenged him during table discussions. (SG1: "Origin")
He was sent to Earth in search of Ba'al by Gerak. He first captured Alex Jameson and tortured him for information. He later captured Ba'al and Gerak executed him but it was only a clone. (SG1: "Ex Deus Machina")
He continued to be Geraks personal assistant. Even though he is primarily skeptic against the Ori religion, he soon follows Geraks belief. (SG1: "The Fourth Horseman, Part 1")
2006
After Gerak's death, he remained on the Jaffa High Council and opposed the motion to dissolve the Council and still wanted to force the Jaffa to follow Origin. (SG1: "Stronghold")