Justinius the Harbinger

Justinius the Harbinger is a level 70 elite draenei paladin found at the Dark Portal in the Blasted Lands during the Dark Portal Opens event. He is a member of the Argent Dawn. He spawns with level 65 Azuremyst Vindicators. After the event, Justinius can be found at the Stair of Destiny, the other side of the Dark Portal in Outland's Hellfire Peninsula, where he leads a blockade of Alliance and Horde soldiers acting as a defense for the Portal.

Quotes

Yells when Spawns: Soldiers of Azeroth, you now fight against the vile Burning Crusade. And the hopes and prayers of all Light-loving people march with you. In the company of our brave allies and brothers -in-arms you will hold your ground and break the demonic charge. You will stem the destructive tyranny that rages across so many worlds.
Says: With each passing moment, I see the people of Azeroth prove again the reasons we have come. It is with solemn pride that I fight with you, and if I die this day, then I die among friends.
Says: The demons should be in no doubt that we are their nemesis and, though they wish our destruction, it is we who bring about their ruin. Kazzak and his forces will be diminished and defeated by this coalition. And to do this, we must throw at them our bodies and hearts, for they seek no less than the obliteration of this world.
Yells when despawns: Fight on, good people of Azeroth. And take heart! Your brethren rush to this hellish portal and will soon throw themselves at these demons as you have so bravely done. May the Light keep you!
The attackers shall not succeed! Grace and glory to the Alliance!

Justinius is probably a play on letters named after Justinian I, a major Byzantine/Roman Emperor.
Periodically heals both Alliance and Horde players.
Many elements of his speech come from Dwight D. Eisenhower's pre-D-day letter to the troops of the AEF.