That was not your argument and you know it. I am going to make this my final contribution to this thread because it cannot progress.
Secular history or biblical history does not confirm your doctrine. You are laboring to make the bible conform to your doctrine and you will not submit to what it says.
There has not been a continuous reign of the family of David over Israel from the days 2 Samuel 7 was written or since David took the throne. That is not the promise. All of Israel has been scattered through the nations. The tabernacle of David has been cast down to the ground. The voice of the scriptures says so plainly.
Amos 9:8 Behold, the eyes of the Lord God are upon the sinful kingdom, and I will destroy it (the kingdom) from off the face of the earth; saving that I will not utterly destroy the house of Jacob, saith the Lord.
9 For, lo, I will command, and I will sift the house of Israel among all nations, like as corn is sifted in a sieve, yet shall not the least grain fall upon the earth.
10 All the sinners of my people shall die by the sword, which say, The evil shall not overtake nor prevent us.
11 In that day will I raise up the tabernacle of David that is fallen, and close up the breaches thereof; and I will raise up his ruins, and I will build it as in the days of old:
I don't know what else to say if you don't believe the above. David was king over 12 tribes.
The tabernacle of David was still cast down in AD 42 when James said the following, and still is to this very day.
Acts 15:13 And after they had held their peace, James answered, saying, Men and brethren, hearken unto me:
14 Simeon hath declared how God at the first did visit the Gentiles, to take out of them a people for his name.
15 And to this agree the words of the prophets; as it is written,
16 After this I will return, and will build again the tabernacle of David, which is fallen down; and I will build again the ruins thereof, and I will set it up:
17 That the residue of men might seek after the Lord, and all the Gentiles, upon whom my name is called, saith the Lord, who doeth all these things.
18 Known unto God are all his works from the beginning of the world.
Whether men believes God or not is up to them. There is nothing about this that is hard to understand. It seems to be hard to believe, at least by some.
Your argument is simply in vain, due to God's word.God plainly said David's dynasty was then established FOREVER, with no interruptions. You're looking for a line of continuous kings, while "throne", as used in the Scriptures being discussed, means "rulership", not necessarily "royalty". it could be a PM, President, Premier, Chief, Big Kahoona, or any such title.
And you know that after Solly, no one has ruled both Judah and "Samaria".Thus, the Davidic line no longer ruled ALL Israelis, beginning with Rehoboam.(Remember, when Rehoboam wanted to assemble his powerful army & conquer "Samaria", God forbade him to, saying the division was from Him.) But when Jesus returns, He will not only rule both, but He will rule the rest of the world as well.
Now, how important to God is God's promise to David? Besides His promise of Shiloh, the Messiah, the Savior, etc, all the titles & offices Jesus holds or will hold, it's the most-powerfully re-iterated promise in the Bible. And God re-iterated it just before He ended the Davidic dynasty's rule over the Jews, so they'd know the dynasty would be kept going uninterrupted somewhere.
Your refusal to offer up any candidate for that ruling davidic descendant is very-telling, showing you simply don't believe God's promise to David. He overturned that throne when He toppled Zedekiah & DQ's Coniah & sons, so there were still 2 more overturns to occur, according to God's word to Zeke.
I presented the British throne as a possible candidate because it's had 2 overturns, originating in what's now Ireland, being overturned to Scotland, being overturned to Britain. (When it originated in Eire, the Davidic line still ruled Judah.) (Remember "a nation & a company of nations"!) While I could be completely-wrong about that, I'm 100% right that there's a descendant of David's ruling over some Israelis somewhere; GOD SAID SO!