The Proto-Albanian language is the unattested language from which the Albanian language later developed. Albanian has evolved from an ancient Paleo-Balkan language, traditionally thought to be Illyrian.
History
Vladimir Orel is one of the main modern international linguists to have dealt with the passage from Proto-Indo-European to Proto-Albanian to modern Albanian. According to Orel, the study of Proto-Albanian syntax remains in its infancy. Hence there are some limitations to the work; however there have been developments in the understanding of the historical development of phonetics and vocabulary.
References
Proto-Albanian language Wikipedia(Text) CC BY-SA