'The Lord's throne' signifies, in general, the whole heaven, and specifically, the spiritual heaven, and by extension, divine truth proceeding, and so, everything of heaven and the church.

In Genesis 41:40, this signifies things that are natural. (Arcana Coelestia 5313)

In Exodus 11:5, this signifies the falsified truths of faith that have wrongly receive attention. (Arcana Coelestia 7779)

'The throne built by Solomon,' as mentioned in 1 Kings 10:18-20, signifies both royalty and judgment.

In Isaiah 66:1, this signifies celestial and spiritual things which when they relate to the Divine are like natural things to man's spiritual and celestial. (Arcana Coelestia 2162[8])

In Matthew 25:31, this signifies judgment. (Arcana Coelestia 4809[3])

In Revelation 1:4, this signifies the universal heaven. 'Throne' signifies heaven and judgment.

'Throne,' as in Revelation 4:2, signifies a representation of judgment, because the things which John saw were representative visions. He saw them as he described them, but they were forms representative of things to come.

In Revelation 8:2, this signifies the church regarding doctrine.

'Throne,' as in Revelation 12:5, signifies the angelic heaven.

'Throne' also signifies the government of falsity and evil in Revelation 2:13, 8:2, Daniel 7:9, Haggai 2:22, and Isaiah 14:13.

(References: Apocalypse Explained 8 [2], 289)

3009. As to the second point - that Messiah, Anointed, or King is the same as Divine Truth - this is clear from very many places in the Word, and has been shown frequently in explanations; as in 1672, 1728, 2015, 2069. The Lord Himself also teaches the same in John,

Pilate said to Jesus, Are you not then a king? Jesus answered, You say it, because I am a King. For this I was born, and for this I have come into the world, to bear witness to the truth. Everyone who is of the truth hears My voice. John 18:37.

From this it is clear that the Divine Truth itself is at the root of the Lord's being called 'the King'. The reason why kings were anointed and consequently called the anointed was that 'the oil' with which they were anointed meant good, 886, 2832. Also the truth, meant by 'king', was derived from good and was accordingly truth grounded in good, so that the kingly office with them represented the Lord as regards Divine Truth which is derived from Divine Good, and so represented the Divine marriage of good within truth, whereas the priestly function represented the Divine marriage of truth within good. The latter is meant by Jesus, the former by Christ.