In the trilogy, , Patricia Cori mentions the Arien as one of the four alien races whose DNA was used to create mankind. The Arien allegedly are a white skinned race from Orion.
(Two other races are mentioned by name: the Alt and the Engan. No name is given for the fourth, yellow-skinned race).
Note that thus far I have not come across any other author who mentions these alien civilizations. This information was channeled.