From Halopedia, the Halo wiki
Manus was a Jiralhanae in the post-Human-Covenant War era.
At some point in 2553 he and the crew of the Piety discovered a Huragok on a ship known as Serene Certainty. He was loyal to a Sangheili Shipmaster Buran 'Utaral, so he attempted to deliver the Huragok to him. While en route to Sanghelios, the Piety was ambushed by the UNSC Port Stanley. Manus and the rest of the crew were quickly killed by Naomi-010, Malcolm Geffen and Vasily Beloi.
Manus is a Latin masculine name meaning "hand".