Conlangs based off of Indo-European languages.
According to Wikipedia: "The Indo-European languages are a family (or phylum) of several hundred related languages and dialects, including most major current languages of Europe, the Iranian plateau, and South Asiaand also historically predominant in Anatolia. With written attestations appearing since the Bronze Age, in the form of the Anatolian languages and Mycenaean Greek , the Indo-European family is significant to the field of historical linguistics as possessing the longest recorded history after the Afroasiatic family."
The Encyclopedia Britannica lists the following subfamilies: "The well-attested languages of the Indo-European family fall fairly neatly into the 10 main branches listed below; these are arranged according to the age of their oldest sizable texts":
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