. . . . "The history of Proto-Slavic is the linguistic history of the Proto-Slavic language, the hypothetical ancestor of the modern-day Slavic languages, as it developed from the ancestral Proto-Balto-Slavic language (c. 1500 BC), which is the parent language of the Balto-Slavic languages (both the Slavic and Baltic languages, e.g. Latvian and Lithuanian)."@en . .