This mod seeks to give you the experience of being restoring Britain to strength as the heir to King Arthur. Allows both West Germanic and Celtic (though it definitely favors Celtic) characters to get Excalibur and proclaim themselves the Once and Future King.

Features:
*Artifacts: 
Rhongomiant, Excalibur, Caliburn (The Sword in the Stone) are all available to be found.
Send councillors to hunt for the Thirteen Treasures of Britain
*Bloodline: 
Bloodline of Mordred and Arthur are both available
*Event Chains:
Events for meeting Merlin, reforming the Round Table, facing the Green Knight, and Meeting Morgan
Event chain for finding Excalibur
Event chain for Mordred's return and invasion of your England (occurs in the 900s)
Spouse interactions and Anniversaries
*Decisions:
Knight characters!
A new tournament system from HIP. There's no good tournaments on here and I adapted it to a basically vanilla playthrough with some changes. Biggest change is no need to be independent and 3 year cooldown.
Reform Camelot by decision. Multiple requirements for this, but the Great Work is in Winchester.
*Cultural Changes
Briton introduced to the game along with the retinues 
*Religion
Opportunity to go back to paganism (No Celtic Paganism at the moment, just generic but considering adding it)
*Minor Titles: 
Minor titles with specific bonuses are used to represent the Round Table. With titles, like Gawaine, Merlin, or just a knight
*Ambitions: 
Related to tourneys and romance
*Great Works:
Camelot Great work has a set of unique upgrades
The artifacts and bloodline in this, being based of a mythical character, are powerful. They're comparable to the best of the best in vanilla.
*New Characters:
Arthur, Guenevere, and Kay reborn in the 867 start. Mordred attacks in the 900s. Find them in Cornwall. Alternate, but familiar names were used based off potential historical or alternate spellings

This mod is unabashedly heavily borrowing from really great other mods that have scratched the itch of Arthurian lore in the CK2 setting. A perfect match, honestly. All of these seem to be no longer updating, but they're listed below. If any of the mod authors have an issue with this mod, it will be removed from the Steam workshop.
Arthurian Legacy
Legacy of King Arthur
Twilight of the Gods
Knights and Squires Beta
Soulmates
Historic Immersion Project since I have ported in their tournament system with changes.
AGoT for some trait icons.

Planned Updates:
[strike]Quest chains for the Thirteen Treasures of Britain[/strike]
Society for the Round Table limited to the realm
Dragon fights!
[strike]Change to retinues[/strike] 
Rebalance artifacts *Ongoing and likely to continue.
[strike]Redo the Green Knight chain [/strike]
Pict and Irish artifacts (Only a few, spawned at start.)
Great Work for the Round Table at Caerleon
Some sort of custom mercenary units. Let me know if you have any idea.

DLC Requirements:
Monks and Mystics, Conclave is used for some laws

Mod Compatibility:
Should be compatible with most mods  barring the following:
Knight and Squires
Soulmates
Arthurian Legacy
Legacy of King Arthur
Twilight of the Gods