Old Korean
Little data on the languages of the other two kingdoms survive, but most linguists agree that both were related to the language of Silla. Opinion differs as to whether to classify the Goguryeo and Baekje languages as Old Korean variants, or as related but independent languages. Lee Ki-Moon and S. Roberts Ramsey argue in 2011 that evidence for mutual intelligibility is insufficient, and that linguists ought to "treat the fragments of the three languages as representing three separate corpora". Earlier in 2000, Ramsey and Iksop Lee note that the three languages are often grouped as Old Korean, but point to "obvious dissimilarities" and identify Sillan as Old Korean "in the truest sense". Nam Pung-hyun and Alexander Vovin, on the other hand, classify the languages of all three kingdoms as regional dialects of Old Korean. Other linguists, such as Lee Seungjae, group the languages of Silla and Baekje together as Old Korean while excluding that of Goguryeo. The LINGUIST List gives Silla as a synonym for Old Korean while acknowledging that the term is "often used to refer to three distinct languages".