We've been a constitutional monarchy since the late 17th century, and of course, part of that deal is that the monarch, or indeed the close immediate Royal Family, should not interfere with politics that in any way could be seen to affect individual parties.
Now, perhaps one of the most classic cases in the 20th century was Edward the 8th, who during his brief reign went down to Merthyr Tydfil in South Wales, met thousands of people who'd lost their jobs in the steel industry.
In fact, he shook so many hands in the end that he would change and shake with his left hand and he said something must be done to get these people jobs.
It was taken as a direct assault on the Conservative Government of the day.
Nigel Farage said that he thinks this is a "very bad idea"
GB News
We could go on to Edward Heath, as many saw it, using the Queen to get us to join the Common Market and things the Queen said during the referendum on Scottish separation.
And we could, of course, talk about King Charles, who as Prince of Wales, endlessly talked about climate change and net zero.
The intervention overnight from Prince William, I think is the most direct political piece of interference that has international and global implications that I think we've ever seen.
This is what Prince William said: "I remain deeply concerned about the terrible human cost of the conflict in the Middle East. Since the Hamas terrorist attack on its table, the 7th, too many have been killed.
Prince William shared his statement overnight
GETTY
"I, like so many others, want to see an end to the fighting as soon as possible. There is a desperate need for increased humanitarian support to Gaza.
"It's critical that aid gets in and that hostages are released. Sometimes it is anyone faced with the sheer scale of human suffering that the importance of permanent peace is brought home.
"Even in the darkest hour, we must not succumb to the Council of Despair.
"I continue to cling to the hope that a brighter future can be found, and I refuse to give up on that."
The statement from Prince William
GB News/ Prince of Wales
Well, one good thing at least he mentioned the hostages, because almost no one these days seems to talk about the Israeli hostages that were taken on October 7.
But for him to call for an immediate end to all fighting is going to be seen by many in the international community as absolutely clear evidence that Prince William is saying to Israel, 'stop what you're doing'.
Some will see that as being given a free pass to Hamas. Many young people will say, 'Hooray, he's doing the right thing'.
But whether he's doing the right thing or not, has he gone just too far with this? Should our future king intervene in this way? I don't believe that he should.
I think he's making a very big mistake.