In Ezekiel 21:26-27, God declared that Zedekiah was to "remove the diadem and take off the crown: This shall not be the same [a change or transfer was occurring]; exalt him that is low [the Zarhite ruler in Israel] and abase him that is high [Zedekiah of the line of Perez]. I will overturn, overturn, overturn it [the crown, that is, the throne]; and it shall be no more [overturned] until HE come whose right it is; and I will give it HIM [Christ]" (KJV).
Notice that the final "overturned" was added in brackets for the sake of clarity. Some see this verse as a prophecy of the overthrow of the crown—that it would "be no more" (meaning no longer exist) until Christ came to claim it. Yet this cannot be the meaning of this prophecy or God would be breaking His unbreakable promise to David of an unbreakable dynasty. So the overturning must refer to removing the throne from one nation and raising it up in another. And the mentioning of overturn three times would certainly seem to be saying that such overturning would occur three times—that three times the throne would be transferred to another nation and that it wouldn’t be transferred again until Jesus Christ’s coming in power and glory to take it over.
When was the last time another country’s monarchy was transplanted into the throne’s present location in England? The answer is 1603, when King James VI of Scotland became King James I of Great Britain (the one who commissioned the King James Bible). This is obviously the last overturn to have taken place. Because of it, today’s British monarchs are of Scottish royal descent.
Prior to that, was another country’s throne ever transplanted into Scotland? Yes. The throne of the Scoti (as the Irish were anciently called) was moved from Ireland into southwest Scotland in the late fifth century—their kingdom of Dalriada in that area, centered at Iona (a name perhaps related to Ionia of Greece), eventually growing to envelop what is now Scotland. This was clearly the previous overturn—which is why Scotland’s monarchy, which became Britain’s monarchy, was actually Irish.
Now since these were the last two overturns of three, there can only have been one other—the first. And that first overturn had to have been the transfer of the throne from Judah. Thus it should be clear that this transfer must have been from Judah to Ireland. Had the throne been transferred from Judah to some other country before later being reestablished in Ireland, that would add a fourth overturn—when Scripture appears to allow for only three. By simple deduction, the three overturns must have been: 1) Judah to Ireland; 2) Ireland to Scotland; 3) Scotland to England.
It should be mentioned, though, that in the first overturn it is possible that the daughter of Zedekiah married into the Milesian Zerah line in Spain or elsewhere around the time it was in the process of assuming control over Ireland. This would not be adding another overturn from Spain to Ireland, as it would all be part of the same overturn. Whether or not this happened, however, is dependent on exactly when the Milesians from Spain took over Ireland, which is not entirely clear. They may have already become established in Ireland before Jeremiah’s journey—though perhaps still maintaining control over part of Spain when he arrived. Again, however, it is possible that Zedekiah’s daughter and Jeremiah actually accompanied the Milesians in their invasion of Ireland from Spain.