Iberia or Iberia?
Ultra rare0.5%All-the-thingsOptionalSingle-player
As an Iberian culture character, control all of the Caucasian Iberia region
The joke: Iberian-heritage culture, Caucasian Iberia - the nine counties of Hayk, Hereti, Kakheti, Kartli, Klarjeti, Lori, Tao, Tbilisi and Vanand. Not available to ruler-designer characters, so the wiki route is pleasingly roundabout: play the 867 Abbasids, who already hold about half the required counties. Conquer the rest of the Caucasus, then work west through the Mediterranean to Mayurqa in the Balearics, move your capital there and convert to the local Iberian-heritage culture - condition met, while the Caucasus stays yours. Needs Fate of Iberia.