I love that you've put the Mari in. When I was at primary school every year we'd have one come around at Christmas and we'd sing songs to it in Welsh.
Big credit should go to Ordep for that one, he put that one together. It's a small little fun event chain, but I liked it when it first popped up for me when I was testing the Welsh out earlier.
Which is exactly why it would be cool to do. Specially if you gained some relationship penalties if you didn't menage to convince the realm of your claim.
Right, this was sort of my point. The follow up was "And give you a decision to change your dynasty to Pendragon/Aurelianus?" I totally respect the notion that there can be only one Once and Future King. I just figured a Briton re-conqueror would claim that mythology as a dynastic, rather than messianic, label. The trait wouldn't have to be passed on generationally - though maybe it would have a small chance of such - but a ruler of Britain that achieved it would be re-affirming that they were Arthurian in both blood and spirit. That could skip several generations, or even be found in another dynasty.
Truth be told, your name fits your idea of the trait's representation better than mine. I guess I'm thinking more about a Celtic Pagan Britain, where the druidic notion of that sort of quasi-reincarnation might prevail. What can I say, I'm a sucker for dreaming about what RoI mechanics mean for superskierpat's Ancient Religions. "In Arthur's Likeness" probably fits a presumably Catholic Britain much better.
Ideally what will happen is the first ruler of Britain will definitely get it. A few subsequent rulers of Britain will also get it if they have enough awesomeness. You'll see it pop up frequently enough, I think - not common, you'll have to earn it, but it won't be super-rare.
I thought about it further and I don't really recall any instances where historically leaders actually claimed descent from Arthur. It seems that by the time the Arthurian legend developed towards what we know as it is today, during the high medieval era (so pretty much every CKII startdate onwards except 867), Arthur also didn't have any sons apparently, so there's that too (although that's probably not much a problem since people will make up anything, but still).
The Arthurian stories in Malory's "Le Morte d'Arthur" mixes Christian elements with pagan elements particularly Celtic religion. The Green Man, Cernunnos as in "Sir Gawain and the Green Knight" It might be possible to form a Celtic-Catholic religion as a result (it'd probably be considered a heresy by Roman Catholicism proper) There's echoes of Queen Mab in Morgan Le Fay etc..and superstitution rang quite strong in those days (that's HOW you get all those witch burning frenzies in the Middle Ages...) Then there's Roman paganism as a remnant from Roman times in Britain.
I'm pretty sure Lux Invicta covers this ground quite a bit but I wouldn't mind seeing VIET explore this particular area of religion - especially with events dealing with paganism and Christianity.
After all, the whole "Once and Future King" has a definite aura of mysticism (and supersitution) about it. It was supersition that apparently compelled William the Conqueror to unearth Ivar the Boneless' remains allegedly "guarding" England before engaging in the Battle of Hastings.
I believe a few of our flavor events inevitably hark back to pre-Christian beliefs and customs, anyways, obviously quite a number survived. No plans for a Celtic-Catholic religion, though, at the moment, that seems more like a LI or alt history sort of overhaul mod.
In a later update we may add on a bit to the Knights of the Round Table, giving them more flavor when your Knights of the Round Table might start emulating the legendary knights, or are thought of by others to be like them, and we may throw in some more mystical and legendary... stuff... in. If we have time.
Is this trait reserved for only the Celtic cultures, or does this go for anyone who manages to unite Britain?
Only Briton cultures (i.e. Welsh, Cornish, Bretons, Cumbrians, and Norsebritons) can unite Britain in the first place (the decision re-creating Britain (which is vaguely similar to Israel, if you want an analogy) is only available to those cultures), so the trait will only go to Briton cultures in such an instance. As for subsequent rulers of Britain, they also have to be of Briton cultures.