IE pers.pron. (dual forms)

[Ralf-Stefan Georg]

>In the matter under discussion, someone may be able to tell us, in the
>historical record, if <jam> is attested earlier than <jamui>.

Mazhvydas (1547) has /jem/, Bretkunas (1591, his native language might have
been Prussian)) has /jamui/, Dauksha (1599) /jam/.

These attestations, at the beginning of Lithuanian writing, are too close
to each other to infer any chronological hypothesis from them. However,
that the pronominal Dative singular was, in Proto-Baltic, longer than just
-m, viz. at least -mu is documented by Prussian forms such as /kasmu/,
/tenne:ismu/, /schismu/ aso.

St.G.

Stefan Georg
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