PiePower's Picts mod for Crusader Kings II

The mod adds to the game:

• Several knew Kingdoms (Gaels, 'Fortriu, Alba, Galicia and the 'Combrogi' - West Brythons).
• Linguistic accuracy to the best of my ability, with new Pictish (based of Welsh/Brythonic), Irish, Welsh, Mannish, Scottish, Norn, Galician and Breton place names.
• New Celtic cultures (Pictish, Norn, Mannish, Galician).
• The possibility to make a Celtic Empire (Empire of the Brythons, Celtas, or Goidels etymologically, based on the founder).
• Celtic Christianity as a new religion.
• A full Celtic music pack, of which almost all the music can be accredited to Adrian von Ziegler, who for the record allows non-commercial use of his videos provided credit is given.
• New Mercenary units (Woad Warriors, Scottish Skiltron, Irish Kerns).

History
In the year 867 the primary title of the King of Alba (Scotland & Pictland) remained King of the Picts, the Mac Alpin dynasty was essentially the last Pictish dynasty although they were a Gaelic dynasty originally, the naming of this country as 'Scotland' in CK2 is historically inaccurate. Constantine I was certainly first and foremost known as the 'King of Picts' and was likely Pictish-speaking, not Scottish, he is often known as the 'Last King of the Picts', and so this is my mod to create and expand upon a Pictish Kingdom. Note that this mod is only really designed to work in the Old Gods beginning, as it deletes the Kingdom of Scotland and adjusts the in-game history to allow the Mac Alpins to control all of Alba.

Detail
Titles:
The Pictish Kingdom of Fortriu exists as the primary title of Constantine I.
The Scottish Kingdom of the Gaels exists as the secondary title of Constantine I.
The de jure Kingdom of Alba exists as a historical representation of the unification of the Picts and Scots as the Kingdom of 'Alba'.
The flags of nations such as Wales and Ireland have been changed to be more historically accurate (e.g. Wales is now represented by the flag of Saint David and Ireland uses the old Coat of Arms).
The Kingdom of Galicia is now present, under a Breton dynasty.
The Kingdom of the Combrogi - a united Arthurian Kingdom of Wales, Cumbria and Cornwall is now possible to form, represented by the red dragon.
The duchy of Brittany has been entirely replaced with the Kingdom of Brittany.
The addition of a de jure Celtic Empire, with either a Brythonic, Iberian or Celtic name based on the ruler's culture, replacing the Empire of Britannia but including the seven Celtic nations and cutting out England, which is moved into the Empire of Scandinavia.
Cultures:
Pictish - An ancient, possibly pre-Indo European culture (but Celticised) related to the Caledonians that existed north of Hadrian's wall for thousands of years.
Norn - A representation of the the Norse-Gaelic culture and language (known as Norn) that formed in the north of Alba as a result of mixing of the Viking settlers with the native inhabitants.
Mannish - The Gaelic culture of the Isle of Mann, under Norse occupation.
Galician - The, arguably Celtic, culture of what is now North-West Spain.
Religion:
Celtic Christianity - The addition of a Celtic Christian faith, based off the historical monastic movement in Dark Age Britain and Ireland, covering the historical areas where Celtic monasticism and the Cult of Saints was present, with a detailed in-game description and lead by the Abbot of Clonnard Abbey.
Norse Paganism - As already existed, but worth noting it includes the areas that have the new 'Norn' culture.