When the apostle John opens the Book of Revelation, he introduces Jesus Christ as "the ruler of the kings of the earth."

John to the seven churches that are in Asia: Grace to you and peace, from Him who is and who was and who is to come, and from the seven Spirits who are before His throne, and from Jesus Christ, the faithful witness, the firstborn of the dead, and the ruler of the kings of the earth. To Him who loves us and released us from our sins by His blood - and He has made us to be a kingdom, priests to His God and Father - to Him be the glory and the dominion forever and ever. Amen. Behold, He is coming with the clouds, and every eye will see Him, even those who pierced Him; and all the tribes of the earth will mourn over Him. So it is to be. Amen. (Rev 1:4-7)

When the heavenly beings (angels, living creatures, and the elders) speak of Jesus Christ, He is recognized as the ruler over all creation.

After the 7th and last trumpet, Jesus Christ begins to actively assert His rule over earth. The Temple of God in heaven opens (Rev 11:19) and the Second Coming of Jesus Christ begins; He initiates the process of resurrection with the rapture of Believers (1 Cor 15:42-54; Rev 14:14-16).

After the 7th and last bowl, the apostle John observes the opening of heaven and the Lord Jesus Christ's kingly titles of honor.

And I saw heaven opened, and behold, a white horse, and He who sat on it is called Faithful and True, and in righteousness He judges and wages war. His eyes are a flame of fire, and on His head are many diadems; and He has a name written on Him which no one knows except Himself. He is clothed with a robe dipped in blood, and His name is called The Word of God. And the armies which are in heaven, clothed in fine linen, white and clean, were following Him on white horses. From His mouth comes a sharp sword, so that with it He may strike down the nations, and He will rule them with a rod of iron; and He treads the wine press of the fierce wrath of God, the Almighty. And on His robe and on His thigh He has a name written, "KING OF KINGS, AND LORD OF LORDS." (Rev 19:11-16)

An angel of one of the seven bowls explains the coming conflict and victory at Armageddon.

These will wage war against the Lamb, and the Lamb will overcome them, because He is Lord of lords and King of kings, and those who are with Him are the called and chosen and faithful." (Rev 17:14)

With His victory over evil on earth, the King Jesus Christ sits on the Great White Throne.

Then I saw a great white throne and Him who sat upon it, from whose presence earth and heaven fled away, and no place was found for them. (Rev 20:11)

With the creation of a new heaven and new earth, the New Jerusalem is where God, the ruler of everything (Rev 19:1-6) is seen together in unity with His Son, the agent of His salvation and judgment. God and His Son are effectively the temple (Rev 21:22). The glory of God powers the lamp of His Son and illuminates the city (Rev 21:23; 22:5).

I saw no temple in it, for the Lord God the Almighty and the Lamb are its temple. And the city has no need of the sun or of the moon to shine on it, for the glory of God has illumined it, and its lamp is the Lamb. The nations will walk by its light, and the kings of the earth will bring their glory into it. In the daytime (for there will be no night there) its gates will never be closed; and they will bring the glory and the honor of the nations into it; and nothing unclean, and no one who practices abomination and lying, shall ever come into it, but only those whose names are written in the Lamb’s book of life. (Rev 21:22-27)

Then he showed me a river of the water of life, clear as crystal, coming from the throne of God and of the Lamb, in the middle of its street… (Rev 22:1-2)