How do we know that Christ is the King in Psalm 45?

In Psalm 45, God the Father directly addresses the Son, declaring His authority and kingship, stating, 'Thy throne, O God, is forever and ever.' This title not only acknowledges Christ's royal position but also affirms His divine nature. The psalm describes the majesty and glory that accompanies His reign, noting that He rides forth prosperously because of truth, meekness, and righteousness. Such scriptural affirmations indicate His pivotal role as King, distinguishing Him from all earthly rulers. Additionally, Christ’s accomplishments—such as fulfilling the law and conquering death—further solidify His identity as the King who reigns over His people with power and grace.