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| Proto-Korean | |
|---|---|
| Name | Proto-Korean |
| Region | Korean Peninsula, Liaodong, Manchuria |
| Era | c. 1st millennium BCE – 7th century CE |
| Familycolor | Koreanic |
| Family | Proto-Koreanic (reconstructed) |
| Target | Old Korean, Middle Korean |
| Script | None (reconstructed); later Chinese characters, Idu script, Hyangchal |
| Iso | none |
Proto-Korean was the reconstructed ancestor of the Koreanic languages, hypothesized to have been spoken on the Korean Peninsula and adjacent parts of Liaodong Peninsula and Manchuria before the attested stages of Old Korean and Middle Korean. Reconstructions draw on data from Old Korean inscriptions, Middle Korean texts such as the Hunminjeongeum, placenames recorded in Samguk Sagi, loanwords in Classical Chinese, and comparisons with neighboring languages and families. Debate over its internal structure, phonetic inventory, and external affiliations continues among scholars associated with institutions like Seoul National University, Kyoto University, Harvard University, and Academy of Korean Studies.
Scholars define Proto-Korean as the hypothetical proto-language that gave rise to the attested Koreanic varieties including Gyeongsang dialect, Jeolla dialect, Jeju language, Middle Korean, and Koryo Korean; it is reconstructed using comparative methods similar to work on Proto-Indo-European, Proto-Turkic, Proto-Mongolic, and Proto-Japonic. Primary sources for reconstruction include Samguk Yusa, Samguk Sagi, Goryeo-sa, the Hunminjeongeum, and epigraphic materials such as the Stele of King Gwanggaeto and various Chinese dynastic histories like the Book of Sui and the History of Wei. Definitions vary: some authors treat Proto-Korean as strictly ancestral to all Koreanic varieties, while others posit a sequence of stages including a peripheral Peninsular Japonic contact layer.
Chronologies typically place the breakup of Proto-Korean between the late 1st millennium BCE and the early 1st millennium CE, aligning with archaeological cultures such as Bronze Age Korea, Lelang Commandery, Three Kingdoms of Korea, and migrations documented in Samguk Sagi and Gwanggaeto Stele narratives. Key chronological markers include the spread of ironworking in Kofun period contexts, the establishment of Goguryeo, Baekje, and Silla, and the later standardization visible in the Goryeo dynasty literary tradition. Linguists often subdivide internal stages into Proto-Koreanic, Late Proto-Koreanic, Old Korean (up to 10th century), and Middle Korean (10th–16th centuries), echoing periodizations used for Classical Chinese and Old Japanese.
Reconstructed phonologies rely on data from Middle Korean hangul orthography recorded in the Hunminjeongeum, phonetic glosses in Idu script, Chinese transcriptions in works like the Book of Sui, and comparative placename work of scholars at Sejong Institute. Proposed inventories include a set of stops, affricates, fricatives, nasals, liquids, and vowels with contrasts in aspiration and tenseness similar in discussion to contrasts in Middle Chinese and Old Japanese. Controversial issues include the reconstruction of laryngeal features analogous to debates in Proto-Indo-European studies, the existence of vowel harmony akin to Proto-Turkic or Proto-Mongolic, and the treatment of consonant clusters seen in Goguryeo and Baekje glosses. Reconstructions reference data from Idu texts, Hyangchal poems, the Samguk Sagi phonetic notes, and early foreign transcriptions preserved in Tang dynasty sources.
Lexical reconstruction draws on attested inventories in Silla inscriptions, placenames in the Yeongsan and Han river basins, and borrowings attested in Classical Chinese histories. Proposed basic vocabulary items are compared with cognates in Middle Korean, dialectal forms from Jeju, Gyeongsang, and Hamgyŏng, and alleged parallels in Proto-Japonic, Proto-Tungusic, Proto-Mongolic, and Proto-Turkic. Loanword layers include Buddhist and administrative terms from Middle Chinese and Sanskrit via Chinese monk transmission in Three Kingdoms contexts, maritime terms associated with Silla and Gaya trade, and later borrowings reflected in Goryeo and Joseon records. Major lexical debates concern agricultural vocabulary tied to Yayoi migration models and technological lexemes linked to contacts with Lelang Commandery and Xianbei groups.
Morphological reconstruction uses verbal paradigms visible in Old Korean glosses, suffixes preserved in Hyangga verse, and agglutinative patterns comparable to Middle Korean and modern Jeju language. Proto-Korean is commonly reconstructed as a head-final, agglutinative language with subject–object–verb order similar to Old Japanese and many Altaic-associated hypotheses. Morphological elements reconstructed include case markers, tense-aspect-mood affixes, nominalizing suffixes, and honorific systems that later developed in Silla and Joseon idioms. Comparisons with morphosyntax reported by researchers at University of Tokyo, Peking University, and Yonsei University inform proposals about the evolution of evidentiality, politeness morphology, and verb stem alternations.
The external classification of Proto-Korean has been a major axis of debate: some scholars argue for inclusion in an expanded Altaic hypothesis alongside Proto-Turkic, Proto-Mongolic, and Proto-Tungusic, with typological parallels cited from work by researchers associated with Moscow State University and Helsinki University. Others reject Altaic and propose contact-based explanations involving Proto-Japonic and substratum or adstrate influence from Proto-Tungusic and Old Chinese. Evidence invoked includes shared lexical items, morphological parallels, and areal features visible in Three Kingdoms era inscriptions, trade contacts recorded in Nara period and Tang dynasty chronicles, and genetic studies correlated with migrations discussed by teams at Korea University and Max Planck Institute.
Reconstruction of Proto-Korean uses comparative methods developed in studies of Proto-Indo-European, internal reconstruction from Middle Korean morphophonology, analysis of Chinese transcription practices in the Book of Sui and New Book of Tang, and placename evidence compiled in Samguk Sagi and Dongguk Yeoji Seungnam. Scholars apply phonological correspondences, morphosyntactic triangulation, and paleolinguistic correlation with archaeological cultures like Mumun pottery culture and Gaya confederacy formation. Interdisciplinary approaches combine historical linguistics with genetics from projects at Seoul National University Hospital and Max Planck Institute for Evolutionary Anthropology, archaeology from National Museum of Korea, and textual criticism of Idu script and Hyangchal materials. Ongoing controversies involve the weighting of loanword evidence versus inherited cognates, chronological assumptions tied to Three Kingdoms historiography, and the limits of comparison with proposed relatives such as Proto-Japonic and Proto-Tungusic.