Counterpoint:
(Stole the DNA from reddit. Some people have a lot of talent.)
If you want to start with a royal court:
Brittany, 867. Arrange a marriage with France and c’est voila, you’re safe for the duration (the neighboring French counts love to fabricate claims on Brittany.) If you start in 1066, you’re only a Duke and need another duchy (and 500 gold) to form the Kingdom of Brittany. However, Brittany is a really small kingdom and in short order you can own all the provinces for yourself, just don’t have too many sons Expansion can go any number of directions: Cornwall/Wales and/or Ireland, or if more adventures Castile. Or stay small and end up as the most advanced realm in the world. :)
Holland, 867. (Default duke is actually Norse, although you can convert through event. However I almost always make a custom ruler.) Can consolidate the duchies required to from Frisia fairly easily. Just need to wait for an opportune time to declare independence from Lotharingia.
Dutch culture:
(Bureaucratic ethos is quite strong.)
(Note: I’ve not actually played the following)
With some initial warfare but with event troops:
Jorvick, 867. Feudal Norse. Win the initial war, form a kingdom and get a Norse court.
Haesteinn of Montaigu. Feudal Norse. You start with one province, but he’s pretty famous in CK lore for hopping all over the world, even to India to form kingdoms (I’ve seen the AI take over Lotharingia with him.)
1066:
The Pagan kingdom. Really. It’s “Burma”, the far edge of the map. Not only do you start with a court but with like 12 artifacts too. You can peacefully vassalize your immediate neighbors and avoid war entirely (conceivably.)
French Dukes (Toulouse or Aquitaine.) Occitan culture, which is pretty cool:
(edit: Both border many different cultures and experiment with the different culture options available.)
Since this post is already super long, if you’re not achievement hunting I can’t recommend More Game Rules highly enough. You can really customize the game to your liking (e.g. I turned off AI seduction; every game previously and without exception, almost every son and daughter ended up as an adulterer.)