What does it mean that Jesus is the fulfillment of God's promises?

In Christian theology, Jesus is the fulfillment of myriad promises given by God throughout the Scriptures. His title, as inscribed by Pilate, 'Jesus of Nazareth, the King of the Jews,' stands as a testament to His messianic role, aligning with the prophecies found in the Old Testament, such as Jeremiah 23:5, which speaks of a righteous king emerging from David's lineage. Additionally, this fulfillment encompasses His role as the Savior prophesied in Matthew 1:20-21, who would save His people from their sins. The narrative consistently illustrates that God's redemptive plan was preordained and further affirms that Jesus' crucifixion was part of this plan—to accomplish justice and grace for the elect.