Prof. Karl Otfried Müller writes that the Doric ideal of a "certain loftiness and severity of character" was preserved in Sparta only because it succeeded in keeping herself in an isolated situation. He argues these laws were intended to preserve the native character of the Doric tribe from any taint of foreign influence. However, Müller wrote in the context of a racial, mythographic view of history - they were the invading and occupying force in Lacedæmonia, holding down a population of servile peasants, called Helots, by iron military rule, and so, themselves, in the strict sense, "xenoi".