Judah will always hold the scepter since David. The stone of destiny is believed to be in Scotland and every king/queen has been sworn in on it.
Jacob had 12 children. All twelve became their own tribe. Dan, Asher, Judah, Benjamin, Levi, Gad, etc.
The Israelites divided into northern Israel and southern Israel (Judah & Benjamin). The northern nation was made up of the other 10 tribes.
The northern tribes started worshiping false gods. The Assyrians came in and conquered them. God “divorced” those tribes and the Assyrians would send conquered peoples away from their homeland. Those are the 10 lost tribes.
Those tribes may have become the Scythians and many believe they are the lost sheep Yeshua came for and who would spread the word of Christ. They ended up in Europe.
There are two reasons for divorce accepted by Yahweh, adultery and leaving a non-believer. Those are allowed to remarry. The other allowed to remarry is a widow.
When He divorced the 10 tribes they were never allowed to remarry again and were out of covenant since they were non-believers and in sin.
In comes Yeshua. When He died that allowed them to “remarry” and be brought back into covenant. There’s a reason Yahweh uses marriage as an example so much in the New Testament.
Dan is out for good (most likely Scandinavian peoples) Joseph became Ephraim and Manasseh (his sons). So there are still 12 tribes but two are out of covenant (Judah and Benjamin). They’ll come back in eventually.
These are my thoughts through study. Many disagree with replacement theology in Protestantism. So definitely don’t take my word for it. You’ll have to do your own study and teach your own conclusions.