The many warring houses in Game Of Thrones ensured that the civil war for the Iron Throne was a conflict wherein the winner wasn't a foregone conclusion. However, some Game of Thrones houses are more powerful than others, and when stacked against one-another it becomes clear that some were never destined to rule. The death of King Robert in Game of Thrones season 1 suddenly made the individual strength of each house in Game of Thrones more important than ever. 8 House GreyjoySigil: A Golden Kraken On A Black BackgroundAlfie Allen as Prince Theon Greyjoy on Game of Thrones (2011-2019)One of the most unique houses in Game of Thrones is House Greyjoy, or as they refer to themselves, the Iron-Born. 7 House BaratheonSigil: A Crowned Black Stag On A Gold FieldRobert Baratheon drinking and looking impatient in Game of Thrones.