Meridia

Meridia, whose sphere is also obscured to mortals; who is associated with the energies of living things.

Meridia's holdings in Oblivion are collectively known as "The Colored Rooms". Another Prince whose origins may not entirely be outside of the aetherial, Meridia has at several times been linked to Magnus the Sun. The most famous account of this association is the Tract of Merid-nunda, which overtly casts Meridia in the role of a wayward solar daughter, cast from the heavens for consorting with illicit spectra.

The summoning date of Meridia is 13th of Morning Star. Meridia can also be summoned in her shrine, if the summoner offered something from the corpse of an undead creature at the statue.

Meridia, also known as the Lady of Infinite Energies, hates the undead and the people who practice Necromancy. Somewhere in 3E 433, Meridia was summoned by the Champion of Cyrodiil. Meridia wanted the champion to clean certain cave from Necromancers and their undead. She rewarded the champion her Ring of Khajiit. The same artifact was given by Meridia to the hero of Daggerfall, obviously after the hero finished certain quest from her.

The Ring of the Khajiit is an ancient relic, hundreds of years older than Rajhin, the thief that made the Ring famous. It was Rajhin who used the Ring's powers to make himself invisible and as quick as the breath of wind. Using the Ring, he became the most successful burglar in Elsweyr's history. Rajhin's eventual fate is a mystery, but according to legend, the Ring rebelled against such constant use and disappeared, leaving Rajhin helpless before his enemies.

Back in the First Era, during the Alessia's rebellion, the Ayleids made a pact with Meridia and her minions, Auroran to help the Ayleids against the human rebellion. The Ayleids champion Umaril the Unfeathered bound his life force in the realm of Meridia, this made him has Daedra-like immortality. When he is slain in the mundus, his spirit will float in the Water of Oblivion and eventually returns to Meridia's realm.

Pelinal Whitestrake the champion of men and blessed by the the Eight Divines (Akatosh, Mara, Dibella, Arkay, Stendarr, Julianos and Zenithar), led the battle in the White Gold Tower, he defeated Umaril and his host of Auroran, and the tower fell. However, the spirit of Umaril survived and during the Oblivion Crisis, Umaril once again walked on the surface of Tamriel. His mission was to cast down the worship of the Gods who help Pelinal Whitestrake destroyed him in the First Era.

Champion of Cyrodiil took the quest to recover the Crusader Relics, the armor and weapons of Pelinal Whitestrake. In the end, Champion of Cyrodiil with his host of Knights of the Nine stormed Umaril's stronghold of Garlas Malatar. The Champion defeated Umaril's mortal form and with the Blessing of Talos, he could ascend into the Oblivion and destroyed Umaril's spirit once and for all. Detail conversation of the event can be read here.

copied from http://www.imperial-library.info/book_daedra/index1.shtml