Scientific feasibility of reptilian overlords and humanoid slaves

In my world, I have a reptilian overlord theme, with humanoid slaves. The planet revolves around a binary star system. What are the basic requirements of the climate and the ecosystem, for the reptilians to have evolved more than the humanoids?

EDIT: What are the star temperature and atmosphere required to create a superior reptilian race? This should be kept in mind, that the humanoid race's evolution is hindered by the same atmospheric condition.

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Scientific feasibility of reptilian overlords and humanoid slaves

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