Daval Prestor

Lord Prestor was an alter ego of Deathwing, the maddened and tortured Earth Warden Neltharion. Much like his sister---Onyxia, under name of Lady Prestor---he had attempted to infiltrate and guide Humankind's political and military systems.

Second War
After the betrayal of King Aiden Perenolde and the subsequent occupation of the Kingdom of Alterac, King Terenas Menethil II and King Thoras Trollbane were met with the crowning of a successor. Among such candidates were Prince Aliden Perenolde, Isiden Perenolde and a Lord Prestor---a supposed "distant cousin" of the family. Given the situation, Lord Prestor seemed to have the advantage.

Isiden had fled to the Kingdom of Gilneas, taking shelter under King Genn Greymane's protection and far behind the massive wall; meanwhile, it was unknown whether Prince Aliden would fall to the same sins of his father (despite the rightful succession to the throne) and would later become involved with the Alterac Syndicate. Being the best of the situation, Lord Prestor managed to convince King Terenas enough to even arrange a possible marriage with Calia Menethil.

But shortly after the appearance and seemingly-inevitable succession of Lord Prestor, he had vanished; it is unknown if Lord Prestor was in any way related to the later-appearing Lady Prestor, save for the two Nobles' true forms.