From Halopedia, the Halo wiki
Jupentus was a Jiralhanae stationed on the Covenant ship Valorous Salvation in 2552 when it landed on Beta Gabriel, and its crew sadistically hunted the humans they found there. He served as security chief 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. Jupentus was either killed in the chaos or else was killed by the UNSC reinforcements which landed on Beta Gabriel soon after and eliminated all of the Jiralhanae survivors.
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