Rev 19:11-13
"Then I saw heaven opened, and behold, a white horse! The one sitting on it is called Faithful and True, and in righteousness he judges and makes war. His eyes are like a flame of fire, and on his head are many diadems, and he has a name written that no one knows but himself. He is clothed in a robe dipped in blood, and the name by which he is called is The Word of God."
The White Rider is Christ — identified by four names: Faithful and True, the unknown name, the Word of God, King of kings and Lord of lords. The robe dipped in blood is his own blood (the cross), not the blood of his enemies. He conquers by sacrifice, not by violence.