John saw heaven open and saw the one whom he described as King of kings and Lord of lords mounted on a white horse.

Revelation 19:11-16

11 In the vision I saw heaven opened {open}, and I was surprised to see a white horse. Jesus, the one who was riding on the horse, is called ‘Trustworthy and Genuine/True’. He judges all people according to what is right, and fights righteously against his enemies. 12 His eyes shone like [MET] a flame of fire. There were many royal crowns on his head. A name had been written on him. Only he knows the meaning of that name. 13 The robe he was wearing was drenched with blood. His name is also “◄The one who expresses what God is like/The Word of God►.” 14 The armies of heaven were following him. They were also riding on white horses. They were wearing clothes made of clean white linen. 15 The words that Jesus speaks are like [MTY] a sharp sword with which he will strike the rebellious people of the nations. He himself will rule them powerfully, as though he had [MET] an iron rod. He will crush his enemies just like [MET] a person crushes grapes in a winepress. He will do this for God Almighty, who is extremely angry with them because of their sins. 16 On his cloak close to his thigh a name had been written {he had written a name}, which is “King who rules over all other kings and Lord who rules over all other lords.”