King is one of the heroes you can get in Evony Age II. To capture a King you will need to complete all King Quests that can be found by clicking Quests and the first one will say King Quest. This is for Female avatar characters. You pick your avatar at the start of playing Evony. The other hero for male avatars is a Queen.
Kings unlike any other hero start with all attributes at 85 points. 85 in Political/Intelligence/ and Attack. Many people use Kings as attack heroes because: Enemies cannot take them away, They are good for attacking, and Loyalty of Kings does not fall. Before you could take multiple Kings conquering a HC that had a King in it. This has been patched and can no longer be done