The Principality of Kormenia or Duchy of Kormenia (Hellenic: Αρμενίων πριγκιπάτο: "Kormenian Grand Principality") was the earliest documented Selloi state in the Rothinoi Peninsula, established 895 following the 9th century Korimi conquest of the Rothinoi Peninsula. The Korimis, a semi-nomadic people forming a tribal alliance led by Klassr, founded the Principality of Kormenia at the very end of the 9th century. They arrived from Kolomea which was their earlier principality east of the Peninsula. The Ruthene historiography calls the entire period from 896 to 1000 "The Age of Principality".