Before George R.R. Martin’s Westeros endured the Game of Thrones, Aegon the Conquerer set up his House of Targaryen to rule the Seven Kingdoms. Now, HBO is gearing up to show us the mayhem that happened when this house splintered into two sides that each claimed the Iron Throne. In one corner, Rhaenyra Targaryen had been named rightful heir by her father. On the other side, Aegon Targaryen II had been erroneously elevated to king after his wife, Alicent Hightower, mistakenly interpreted King Viserys’ deathbed ramblings.