Proto-Georgian-Zan (also referred to as Proto-Karto-Zan) is a

reconstructed language Linguistic reconstruction is the practice of establishing the features of an unattested ancestor language of one or more given languages. There are two kinds of reconstruction: * Internal reconstruction uses irregularities in a single language to ...

which is the common ancestor of

Karto-Zan languages The Karto-Zan languages, also known as Georgian-Zan, are a branch of the Kartvelian language family that contains the Georgian and Zan languages. The Svan language forms the other branch of the Kartvelian family, showing characteristic differenc ...

. It had diverged from

Proto-Kartvelian The Proto-Kartvelian language, or Common Kartvelian ( ka, წინარექართველური ენა, tr), is the linguistic reconstruction of the common ancestor of the Kartvelian languages, which was spoken by the ancestors of th ...

during the 19th century BC.

References

* Agglutinative languages Kartvelian languages Georgian-Zan Georgian-Zan languages {{historical-linguistics-stub