From Halopedia, the Halo wiki
Brunus was a Jiralhanae stationed on the Covenant ship Valorous Salvation in 2552. He served as right hand to Chieftain Parabum. Ceretus considered him one of the least intelligent Jiralhanae he had ever met.
Eventually Ceretus orchestrated a confrontation with Parabum which soon erupted into a brawl. Pandemonium reigned and many of the Jiralhanae were killed as they turned on each other. Brunus was either killed in the chaos or was killed by the UNSC reinforcements which landed on Beta Gabriel soon after and eliminated all of the Jiralhanae survivors.
List of appearances