To order the languages based on their arrival in Europe, we can follow the historical and linguistic timeline:
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Proto-Indo-European - This is the hypothesized ancestor of the Indo-European language family and is believed to have been spoken thousands of years ago, before the divergence of the various Indo-European languages.
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Indo-European - Following Proto-Indo-European, the various branches of the Indo-European family began to spread across Europe.
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Latin - As the Roman Empire expanded, Latin became prevalent in the territories it conquered, including much of Western Europe.
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Germanic - The Germanic languages began to emerge and spread across Northern Europe, especially after the fall of the Roman Empire, around the 1st century AD and onwards.
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Slavic - The Slavic languages developed later, around the 6th century AD, as a distinct branch of the Indo-European family, becoming prominent in Eastern Europe.
So the order is:
- Proto-Indo-European
- Indo-European
- Latin
- Germanic
- Indo-European Slavic (referring specifically to Slavic languages)