"After your brother's birth, Tywin threw a tourney in his honour. There he proposed a betrothal between Cersei and Rheagar. Aerys declined, fearing Tywin's power and did so in an extremely insulting way. After this day, the king always oft decided to do the opposite of what Tywin proposed, regardless of the consequences. This is how Aerys ended up imprisoned in Duskendale over a city charter, despite the Hand's wise advice to not go in person."