I am all in favor of highlighting differences between the various Periods. It will make them stand out more in comparison to each other. It also highlights the challenge of navigating the entire GPC when they have different emphasis and challenges.

Thinking it is based on time. When did the Great Sword become a weapon? The starter set is dealing when Arthur first comes out. There are other weapons not mentioned as well, thus my assumption.

also, at least one of the pregens have errors. But yes, everyone who is knighted has at least one Glory Point they could spend. You can make one trait a 16, and Valorous starts at 15. Knighted, and you could easily have two 16's.

see the city! 91.

I might be misunderstanding, but perhaps you are meant to meet Arthur while playing in Book 1, "The Adventure of the Sword in the Stone"? That being said, when I ran my group through it, I used Book 1, the Sword Tournament, and some additional sources of mine to make it a bit more involved before the actual Tournament.

Now, would you want to rerun it? If so, same basic plot line, or what else would interest you?

There should be 1d20 and 6d6 based on the Starter Set I was allowed to see and examine.

That is also how I see it. By removing the random nature, you have full control over your character. Every choice you make determined your character. As Morien points out, BoK&L which is also a 5th edition book has the random generation system in it. In fact, the subtitle says it is the "Advanced Character Generation for King Arthur Pendragon, 5th ed."

Mind sharing which older systems were more interesting? Not necessarily the details, but which ones and why?

You could always divide the quest into two different ones. The Grail for Christians and the Cauldron for Pagans. However, if the PKs do not complete both, then the ultimate quest follows what is the default story where the Grail quest fails. So, essentially the same, but the players may have a story to tell and is different than them going on a quest that is not meant for them. As others have said, the could convert to Christianity and try as well. 

I also have a group of young PKs, so during the final episode, I had forshadowed an alternative choice through a vision where they went through a hidden path and had a chance to disrupt the Saxon magicians from summoning their Dragon. It was climatic, death and destruction all around, and the players had a blast. No, no fireballs, just the type of fighting you would expect from heroic activities.

For ease of play, it is assumed that the Berrocingas have given up the slave portion of their culture as it is frowned upon in the civilized portions of Logres. As always, YPMV.

And, the great thing about KAP is, YPMV. 

I am in the same vein as Morien. I have always been a fan of medieval history with knights and their shining armor, etc. Got into RPGs in the '70s, so kinda grew up with the fantasy element. KAP always made more sense than D&D to me, not that I didn't play it, run it, or enjoy it. Had a 13 year campaign as DM in D&D. But, KAP was always more real as the players aged and no matter how powerful the character was, they were still mortal.

Now, we don't know exactly when 6th edition will be available, so if you want to start a game now, go ahead with 5.2. Many of the rules will be essentially the same, you will get experience with the system, and depending on your desire, 5.2 starts with Uther (Arthur's father), so you can run a campaign of 25 years or so and then update to 6th edition when it comes out. 

Morien, on the KAP discord, has excellent suggestions on how to do this.

I am ok with this definition. More precise than my original vision.

I have always believe it to be a form of outrageous, taken to an extreme. Meaning, one is humble in all things. Nothing should be done to extreme.

I believe that is 1/200 chance, so yes, that could happen. Your family would be the outlier among the Berroc Saxons, the vast majority staying loyal to Vortigern while your family stayed true to a just king.

Not KAP, but here is a quote: 

"This is the oath of a Knight of King Arthur's Round Table and should be for all of us to take to heart. I will develop my life for the greater good. I will place character above riches, and concern for others above personal wealth, I will never boast, but cherish humility instead, I will speak the truth at all times, and forever keep my word, I will defend those who cannot defend themselves, I will honor and respect women, and refute sexism in all its guises, I will uphold justice by being fair to all, I will be faithful in love and loyal in friendship, I will abhor scandals and gossip-neither partake nor delight in them, I will be generous to the poor and to those who need help, I will forgive when asked, that my own mistakes will be forgiven, I will live my life with courtesy and honor from this day forward.”

― Joseph D. Jacques, Chivalry-Now: The Code of Male Ethics

this is a modern take, as sexism would not be in 500 AD, but notice how many traits it hits.

Yes, and using BoK&L, they get the Roman culture and the Berrocs get Saxon culture, and the Jagents can have Picts. Greg was more than willing to make exceptions to history to make the game more fun or fit his vision of the history he wanted. Book of Sires has parts where he wrote things as a result. The GM is always able to tweak their game (YPMV) to suit the story they are telling. If you want to have areas where the culture is different, then by all means, have them.

As Morien points out, there should be a story-wise reason for you knight to have the characteristics, traits, passions, and skills that he has. BoK&L was meant to be used for all periods of KAP. Your Byzantine knight would have loyalty to the Emperor because he has just come from there. If you grew up in Logres, you would have Arthur as your main king, not an emperor who you have never seen, halfway across the world. Be smart and consistent in your character generation. That is why, in my games, I houserule that only you have the backgrounds of non-Cymric knights, but if you marry a Cymric Lady (or vice-versa), your offspring has a modified set, and their children are treated as full-blooded Cymri.

The Regional Modifier apply to ALL cultures in the Region.

So, to summarize BoK&L, your character has a culture they come from. That is where they get their Religion and their religious bonuses, their Passions, their beginning skills values, Cultural Attribute Modifiers, and their Meta-Skill. Where they LIVE, gives them Regional Trait Modifiers, Directed Traits, and Homeland Passions.

Once you live in the area, you will start to acclimatize to it. You can argue that those who migrate to the area will keep their old culture, but their first generation offspring will either be a mix of the two (parents teaching the old ways to them and everyone else teaching the new. HOUSERULE), or the new culture entirely. One can argue that if it is an enclave of that culture, sure, they can keep the old ways alive for a while, but for ease of the gm's sanity and to keep things relatively simple, you can simply use the new culture. As always, YPMV.

Most of my campaigns have not made it into multiple generations, but one thing I did was to have the characters develop their sons/daughters as soon as they were of fostering age (age 7). And on occasion, I had a "flashback" mini-scenario where the players played their younger selves to gather information about the current situation. These would range from a single die roll (using the page/maid or squire/maiden character sheet) to see what they remember, to an adventure.

No map.

Chances are this was probably a pirated copy, but a new and better one is coming…