IIRC The Persians are Caucasians who have somehow been overtaken by the Jihadists. It would not be a surprise at all if the Vikings had been there though.
The Indo-European component of the core Persian population is very, very small.
The question now is when were these people conquered by a small group of Indo-Europeans who then imposed their language on the hapless captive population.
Arabs and Persians are considered "Caucasion".