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I've encountered the phrase “the once and future X” and I'm confused by it. It seems to be closely related to Arthurian legends: the book The Once and Future King (referring to Arthur) or the episode The Once and Future Queen of the TV show Merlin (referring to Guinevere; this use is likely derived from the aforementioned book).

When I try to understand what the phrase means, I would think it's something like “the one who was king in the past (i.e. once) and will be king again (i.e. in the future)”. But that doesn't make any sense to me, based on what I know about the legend of Arthur (which isn't much), he didn't stop being king and then became a king again.

So, what exactly is the phrase supposed to mean?

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  • Once and Future King. Answer..... Guinevere was left alone to bare arthur's son. Merlin was there to protect Guinevere and young arthur' as he grew to become the future king of Camelot
    – user195828
    Sep 11, 2016 at 20:29

2 Answers 2

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It's a reference to the prophecy that King Arthur will return. The idea is that he was once king, and will be again.

As far as I know, T.H. White did in fact coin the English version of the phrase for his Arthurian book The Once and Future King, but you'll occasionally hear it adapted for other uses ("ladies and gentleman, the once and future champion!"), presumably as an allusion to the book. The original source is Sir Thomas Malory's Le Morte d'Arthur (the most enduringly popular rendition of the Arthurian myth), where the equivalent Latin phrase rex quondam rexque futurus is described as engraved on Arthur's tombstone.

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    White certainly popularized the phrase; but Malory quotes a Latin verse 'said by many to be on Arthur's tomb", including the words rex quondam rexque futurus. Sep 13, 2014 at 15:04
  • @TimLymington Thanks for this. I've edited to include it in my answer (albeit a couple years late). Sep 12, 2016 at 13:19
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I'm taking a guess here, but in T.H. White's book of that title about Arthur (if I remember correctly), Merlin, who plays a very prominent role in the book (perhaps more so than even Arthur, at least in the Sword and the Stone book), is traveling through time backwards, so to Merlin, Arthur already was king (Merlin complains about life in the 20th c). Merlin knows Wart's future very well, and also knows his own. When he finally takes charge of Wart (Arthur), Wart is only a boy, who Merlin trains to be a King in Arthur's future. In that way, he is, to Merlin (and Wart), both the once and future king.

That is the only famous use of the once and future that I know of, and as it is a well known book, any other use, especially in fantasy, would be referencing that title.

However, in the Book, Merlin does acknowledge that both he and Arthur will come again (a nod to Arthurian legend):

I will tell you something else, King, which may be a surprise for you. It will not happen for hundreds of years, but both of us are to come back.

Some people have used once and future to indicate enduring or perpetual. I can find uses of the phrase after the book but not before it. Maybe someone else will find an earlier use.

I did find this note in Cliff notes:

Merlyn - A magician who has already lived the future, so he knows what is going to happen next. Merlyn is Arthur’s tutor and friend. Arthur’s creation of the Round Table and a more civilized England is largely due to Merlyn’s influence. Although Merlyn is powerful, he is also kind and a little absentminded.

One of the reasons he's absentminded is that he's always confused about time, since he's going through it in a different manner.

Here, he speaks about Hitler in a way Wart might understand:

There was just such a man when I was young—an Austrian who invented a new way of life and convinced himself that he was the chap to make it work. He tried to impose his reformation by the sword, and plunged the civilized world into misery and chaos. But the thing which this fellow had overlooked, my friend, was that he had a predecessor in the reformation business, called Jesus Christ. Perhaps we may assume that Jesus knew as much as the Austrian did about saving people. But the odd thing is that Jesus did not turn the disciples into storm troopers, burn down the Temple at Jerusalem, and fix the blame on Pontius Pilate. On the contrary, he made it clear that the business of the philosopher was to make ideas available, and not to impose them on people.”

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