Al'Dir
The Al'Dir are a long-living race living in Ur'Ava. They were the original rulers of the Eldar Empire.
The Al'Dir are also know as the hidden folk. They live in the hidden realm, were they are hidden from the physical world.
Exodus from the Old World
The Al'Dir were the first to flee the old world in the Great Cataclysm. Because of their connection to the hidden realm, they were more vulnerable to the madness brought by the wolf.
Eldar and the Unseen Court
From foundation of the Eldar Empire in 545 BF to the dynasty of Helekan, the empire was ruled by the Al'Dir. The empire was ruled from within the unseen court. The unseen court was said to be located somewhere in the woods of Pedexpei, where later Culmen Cornorum was founded.
When Helekan usurped the throne, he had the woods cut down, thereby severing link between the empire and the unseen court.