Isiden Perenolde

Isiden Perenolde was the nephew of Lord Aiden Perenolde, King of Alterac. When Alterac was placed under martial law by order of King Terenas, Isiden fled to Gilneas, where he hoped to rally support. He was eventually backed by Genn Greymane, Gilneas' king, as the matter of the succession began to heat up.

Nothing has been heard from Isiden since then and his status is unknown.

Speculation
Isiden may be the random Death Knight hero in Warcraft III known as Baron Perenolde.