Robert Baratheon is the king of the seven kingdoms of Westeros. He rose to power by overthrowing the ruling Targaryens with the aid of the Starks and the Lannisters.
Robert also proposes an engagement between Joffrey and Ned's daughter Sansa, hoping to bring their houses closer together.
"I'm not trying to honor you. I'm trying to get you to run my kingdom while I eat, drink and whore my way to an early grave."