Egypt was never caucasoid. Even arabics know that. Though in early times, Greek discoverers were traveling to parts of northern Africa where they discovered a civilization like no other. Mathematicians, Philosophers, even early Scientists. They would travel back to there home lands and report what they saw. At this time, Europe wasn't Europe. Back then, whether you were light skinned black or dark skinned black, you were African. It was the Europeans who used skin tones and complexions to classify people. Africans were and still are multi colored people.
While Africa (the area now known as Egypt, Ethiopia, and the Sudan)was flourishing, Europe was falling into it's dark ages. They needed knew discoveries and food to feed it's people.