Lepidus

Lepidus was a powerful Jiralhanae Shipmaster of the CCS-class Battlecruiser Triumphant Declaration in the Fleet of Furious Redemption. He was the first Covenant to hear of the Key of Osanalan. He led some of the forces in the Second Battle of Earth, precisly in the Battle of Cleveland, where his troops tried to find the Key. It is assumed he was killed in either the above battle, or in the Battle of the Ark, but it is still unknown.

Historical References
Lepidus was also the name of a Roman politician and General who, along with Octavian (later known as Emperor Augustus) and Marcus Antonious (Marc Antony) formed the Second Triumvirate, which governed the Roman Republic from 43-33 b.c.e. He was ultimately ousted from power and killed by his former friend, Augustus.

Trivia

 * He is a Brute Ship Master, with a unique armor color.
 * Lepidus' armor looks like the original Brute Captain's armor, cut from Halo 3: crimson.