The ruling dynasties in Game of Thrones tend to have long, proud histories behind them. Some have sat in their seats for thousands of years. Others are much more recent. Two massive events established the new authority across Westeros. Aegon's Conquest united the Seven Kingdoms, and Robert's Rebellion unseated the most powerful family in the realm. Hundreds of miles from those occurrences, the Iron Islands saw a series of battles and negotiations that saw House Greyjoy take the Seastone Throne.