The line of kings from David would endure forever
Bible prophecy: 2 Samuel 7:16
Prophecy written: Samuel lived about 3,000 years ago
Prophecy fulfilled: Beginning in about 31 AD with the resurrection of Jesus Christ
This Bible prophecy, and a few others as well, allude to King David's descendants having an eternal hold on the throne of Israel.
King David lived and reigned about 3,000 years ago. His descendants continued to reign over all or part of the land of Israel until the time of the Babylonian conquest, which was about 2,600 years ago.
But, aside from Jesus, there has been no king of Davidic descent since the time of the Babylonian conquest. Jesus is fully human and fully God. As a human, he is a descendant of King David. As God, he is eternal. Therefore, he is in a unique position to fulfill the prophecy in which David's throne is to be eternal.