ok and today im answering that request above me im going to talk about ..................
AEGWYNN!!!!
Aegwynn was the second-to-last Guardian of Tirisfal, and the mother of the sorcerer Medivh.
Magna Aegwynn, Matriarch of Tirisfal, was one of the greatest Guardians of Tirisfal. The Order of Tirisfal was originally forged by the High Elves to secretly protect the world from demonic corruption of magic, hoping to avoid the folly of their ancestors. These Guardians were given considerable power and longevity.
When the order was extended to humans after they too began to learn magic, it was kept as a secret Order amongst only the greatest magi. But over time, the Guardian became a puppet of the Order, and the focus was lost. The Guardian became a warden on all who practiced magic.
When Aegwynn became the Guardian, however, she refused to be manipulated. She remained focused on the matter at hand - the demonic powers at play in Azeroth.
But the same hubris that lead to the Guardian's diminishing caused their downfall.
more info
http://www.wowwiki.com/Aegwynn