Lepidus

Lepidus was a powerful Brute 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 then informed the High Prophet of Truth of the Key, which sparked the Battle of Cleveland. He was last seen reporting to the High Prophet of Truth aboard the Forerunner Dreadnought, when the Master Chief attempted to assassinate Truth. Truth escaped, but it's unclear whether Lepidus went with him, or if he stayed to fight the Chief. If he did the latter, he is most likely dead, as the Chief wiped out all Covenant soldiers in the room.

Historical References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 Shipmaster, with a unique armor color.
 * Lepidus' armor looks like the original Brute Captain's armor, cut from Halo 3. This is likely due to the fact that the first issue of Halo: Uprising was released before Halo 3.