This is from an account of Ottoman Albania, written by Antonio Bruni in 1596, I took some parts out, I will add more later:

The Albanians live in part of Epirus,
Dardania, Macedonia and a corner of Illyria;
those who are on the Dalmatian side are Roman Catholics, while
the others, from Durres southwards, are all Orthodox. The language
of these people is very different from Slav and Greek. It may be Alan
or Gothic, brought there by Alaric, who stayed a long time
in Epirus when he was attacking the Roman Empire;
or indeed it may be the ancient language of the Macedonians-which seems
more likely, as it does not resemble the Slav language, which was perhaps the Goths
own language.