A "limited and focused intervention", "largely covert", by Sirians - "an aquatic planet circling Sirius", "in the form of the Nommo in East Africa and Egypt and the Oannes in the Land of the Two Rivers" which "produced the pyramid age in Egypt and the great ziggurats and the palaces and temples of Sumer."
"They were able to do this on the basis of their previous involvement with life on this world and because of the Sirian belief that life on Earth falls within their field of influence"
"This presence had such a seminal effect on early civilization and yet remained so hidden from history's narrative."
(Revelations of the Watchers, p. 97, 111-112, 124)