Numerous lexemes that are reconstructible for the Proto-Slavic language have been identified as borrowings from the languages of various tribes that Proto-Slavic speakers came into contact with, either in prehistorical times or during their expansion when they first appeared in history in the 6th century (the Common Slavic period). Most of the loanwords come from Germanic languages, with other contributors being Iranian, Celtic, and Turkic. The topic of such loanwords in Slavic has sparked numerous sharp debates in the 20th century, some of which persist to this day. Many words that were assumed to be borrowings in Proto-Slavic have had their Slavic origin discovered by linguists studying the field of etymology. Scientists like Max Vasmer and Oleg Trubachyov have done a huge amount of rese