Board Thread:Character Discussion/@comment-26346951-20150713223810/@comment-24674051-20150716143555

One other thing I saw in the TV Guide article is that Josh (or someone) mentions that Charming is going to 'bro out' with Arthur. So that first rules out that Arthur would have been around during Killian's Naval days (though does not rule out that Killian was fighting for or against the Camelot of that era). But it sets up that Arthur's Camelot is recent history (ie, contemporary with the season 1 flashbacks for the Snow White story) and/or Present day. And it looks like it might be some real growth for Charming as a character.

And who knows. I doubt that Arthur is in storybrooke, but it could be possible that one or more of the KOTRT got caught in one of the dark curses.(and let's face it, were going to have to, at some point, accept that other main fairy tale characters exist in storybrooke that we have not yet met).