Who is Leck, King Leck of Monsea from Graceling and what is their importance?

King Leck is the Graced King of Monsea and is revealed to be the one who ordered the kidnapping of Tealiff. Leck has lost one eye. This is important, since this allows him to conceal the fact that he has Graced powers. All the Graced have two eyes of different colors. Leck abuses his power of making people believe his stories. When Katsa is confronted by Leck, she is unable to attack him when he lies that he has just killed Ashen by accident. Leck wants to capture Katsa and make her his tool, but instead is killed by Katsa when he is about to reveal the truth about Prince Po's Graced powers.