“It was popular during the heyday of the British Empire among those who predicted the eventual worldwide hegemony of English-speaking culture.”
I ran across that concept while doing a little research in college. The Scottish Declaration of Independence written in 1320 and signed by Scottish leaders mentions that their kingship line went unbroken back to Moses.
Yes, the British Israelites believe that Jeremiah brought an Israelite princess to Ireland shortly after the Babylonians invaded Judah. They trace the Queen’s ancestry to this princess along a circuitous genealogical thread, by way of Scotland. It puzzles me, though, since there are many females and many links that never reigned over anything. Still, they maintain that the throne of the United Kingdom is Judah’s throne.