Licinius

"I represent those with plans. Plans that no longer concern you."

- Licinius to the Prophet of Truth just prior to abandoning him at the Battle of Installation 00.

Licinius, also referred to as "The Infiltrator", was a Sovereign. Neither of these identifiers is his real name: Licinius was a false name assumed by him during his infiltration into the Covenant Empire and later in the Blood Covenant and the Brotherhood of Ruskt while disguised as a Jiralhanae. "Infiltrator" is a term used to refer to him in Sovereign transmissions, which utilise translation software so advanced that it incorporates idioms from the reader's own experience. His true name, homeworld, date of birth, and even gender remain mostly unknown.

He was responsible for most of the Sovereign invasion of the galaxy, and was sent ahead of the invasion to gather intelligence and to weaken various governments from within to make conquest easier.