{video} How do you put a price on a dragon? That's the most vexing question facing anyone who wants to assess the dynastic fortunes that drive the plot of Game of Thrones, the epic TV series that returned this week. Yes, it's a fantasy saga that mixes medieval knights and castles with sorcery, zombies, and dragons. But at its core, Game of Thrones is a contest involving nine very wealthy families - and Bloomberg News knows how to measure the holdings of real-world billionaires. So we set out to rank the wealthiest of Westeros, comparing their fortunes at the beginning of the series and where they stand before the ... (full story)