Who is on the Throne?

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In Revelation 7:9, we read:
9fter this I looked and there before me was a great multitude that no one could count, from every nation, tribe, people and language, standing before the throne and in front of the Lamb.
Who is on the Throne? Is it the Father, or God as a Trinity with God the Son incarnate also seen as the Lamb? If it is the Father, where would you place the Spirit?

Is there a sense in which God the Son was also in heaven, even during the incarnation?

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