Tanu

The Tanu are generally tall, slender, humanoid aliens that look very similar to humans from Julian May's Galactic Milieu universe. They originate from a distant galaxy, but have fled from their home planet to the Pliocene period of Earth via an FTL living ship along with a co-genetive species called the Firvulag. They are often imperious (especially to humans) and long lived (sometimes over 1,000 years).