Gwynevere, Princess of Sunlight

Gwynevere is the daughter of Gwyn, Lord of Cinder  and a character in Dark Souls. She is voiced by Clare Corbett, who also voiced the Undead Female Merchant and Crossbreed Priscilla.

Appearance
Gwynevere appears in the form of a gigantic woman with red hair, a kind face and ample bosom.

Location
Gwynevere is located in a room above the area in where you fought Dragon Slayer Ornstein and Executioner Smough behind the door with the bonfire in front of it.

Plot
Upon meeting with her for the first time, she will bestow to the player the Lordvessel, a large, golden bowl which is necessary for opening the door to the Kiln of the First Flame, as well as providing the handy effect of allowing the player to warp themselves to various bonfires. Gwynevere will offer to initiate players into the Princess's Guard covenant.

Attempting to damage Gwynevere will kill her, as a result Anor Londo will become dark, causing all regular enemies to disappear (with the exception of the Silver Knights in the East Wing, and the introduction of two hostile NPCs), members of the Blades of the Darkmoon covenant will now begin to Invade this area in order to exact vengeance on the player character.

Lore
There are clues as well as inferences made in game that suggest that Gwynevere is actually an illusion created by her sibling, Dark Sun Gwyndolin, for the ultimate purpose of manipulating the player into linking with the first fire.

However, Gwynevere herself was a real person and indeed the daughter of Gwyn, Lord of Cinder. Along with most of the other gods, she left Anor Londo when it became clear that the Age of Fire was ending. She married the Flame God Flann, but little else is known about her.