Britannica Sources used in this answer

How do linguists reconstruct Proto-Germanic without written records?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Thematic map of Europe displaying the distribution of Germanic languages, with different colors indicating regions where English, German, Netherlandic (Dutch), Frisian, Swedish, Danish, Norwegian, Icelandic, and Faroese are spoken. Striped areas mark regions where bilingualism is common, and language regions cover countries such as the United Kingdom, Germany, the Netherlands, Denmark, Sweden, Norway, Iceland, and parts of surrounding countries. — Germanic languages Distribution of the Germanic languages in Europe.

Linguists reconstruct Proto-Germanic, a parent language for which no written records exist, primarily through the comparative method. This process involves systematically comparing related words, or cognates, across various descendant languages, such as Gothic, Old Norse, Old English, and Old High German.12

By identifying regular sound correspondences among these languages, scholars can deduce the phonological features of the ancestral forms. These reconstructed forms are marked with an asterisk (e.g., Proto-Germanic *kuningaz) to indicate they are theoretical constructs.12

The method relies on the principle of regular sound change, where specific sounds in the parent language evolved into different, predictable sounds in the daughter languages over time. Occasionally, these deductions are confirmed by external evidence, such as ancient loanwords found in non-Germanic languages like Finnish. Additionally, linguists may use internal reconstruction, which examines irregular patterns within a single language to infer earlier, more regular states.123