The Kushan. Persian, European, Greco mutts brought India much of it's modern culture. Not exclusively. The existing culture merged with the Kushan culture to produce modern India.
But a lot of the Brahman caste, especially from the North West have squarer faces today showing that in some areas the Brahman caste are ethnically distinct and partially European.
Look how Persian this Indian actor looks: https://cdn.nextgov.com/media/img/upload/2017/11/02/110217kumailnanjianiNG/860x394.jpg That is a north west brahman.
This predates Islam, and they were culturally Hellenistic.
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