The L'Sheriss Empire
Sometimes called the Eldarrian Empire or Night Elven Empire, the L'Sheriss Empire is named after "The Savior of Elvenkind", Emperor Lindaeyl L'Sheriss and his descendants. Its success is largely attributed to the Mark of the Emperor's defining qualities in the royal bloodline.
History
Its history is divided into four main eras, the first being from the First L'Sheriss Dynasty beginning withEmperor Lindaeyl L'Sheriss on 06/22/0065 and ending with the Fall of Rylithian, Citidel on the Water on 6/02/1992.
The second Era is reffered to as the Betrayal by the night elves and ends with the death of Emperor Crescent L'Sheriss on 10/02/2495.
The third is the state of dormancy in exile underground.
Last and currently is the Second L'Sheriss Dynasty, beginning with the reclaimation of the capital city Rylithian and the reformation of the Empire. Its official start date is the coronation of Emperor Reeve L'Sheriss on 05/21/4018.
The full timeline can be found here.