Joffrey Baratheon now sits the Iron Throne of Westeros. Though he thinks himself the son of the late king Robert, Joffrey was actually born of the incest between his mother Cersei Lannister and his uncle/father, Jaime Lannister. By killing Ned Stark, Joffrey has sparked war with the North, and his questionable lineage has made Robert's brothers Renly and Stannis take up arms in dispute of the boy king's claim.
While Joffrey might be fancying his throne right now, the swords are slowly but surely gathering at his gates. And with his cruel nature, Joffrey could end up making enemies out of his subjects, as well.