Unless you've read A Song of Ice and Fire, you probably weren't totally sure what was going on all the time on Game of Thrones, or what in the Seven Hells some of the characters were talking about when discussing historical events. Even if you read the books very carefully, you could still find yourself reeling; Game of Thrones history is just that dense.
For example, did you know that Robert Baratheon and Ned Stark grew up together as wards of Jon Arryn? Do you know why Daenerys named one of her dragons Rhaegal? Do you know who broke up Tyrion's first marriage? And why does Littlefinger seem to hate everybody? All of these tidbits come from events that occurred before the show even starts!
Fear not! This list is here to quickly fill you in on the most important backstories - some recent, some going back 8,000 years - that inform the events of Game of Thrones. Some are very recent, while others go back 8,000 years.