Men have been fighting over the Riverlands since the Dawn Age, though that is to be expected of things that rest below the Neck. It does not help that the Riverlands are between everything and everything else: The Westerlands' gold, the Reach's grain, the Vale's rock and the North's...snow?
House Mudd once ruled as the Kings of the Rivers and Hills but after 1,000 years their line was exhausted and fell to the Storm Kings, who fell to the ironborn. Blackfish supposes that after years of drowning at sea, the Riverlands looked pretty attractive to that race of pirates and rapers. Never mind that their monstrous castle, Harrenhal, was too large to staff and garrison, it turned out the ironborn would not be there long enough to bother. Aegon I Targaryen landed to the south of the Riverlands and as had many before him liked the look of them. Edmyn Tully led the desertion of Riverlords to Aegon's cause and was rewarded by getting to watch King Harren burn in his own tower.
Unfortunately, that is not all Edmyn got. House Tully was named the Lord Paramount of the Trident, which means they had to keep in line all those lords who had not governed themselves for thousands of years. The Tullys were now responsible for aiding the Mallisters at Seagard against the pouting ironborn whenever they got cheeky. For settling Harrenhal on families stupid enough to think its curse would skip them, after devouring all previous families. For keeping the Blackwoods and Brackens from wiping each other out and giving them two more castles to deal with. For keeping the Freys in their place and out of others' pockets. For marrying off their sons and daughters wisely enough so that they did not follow House Mudd into the mud.
Yet under the Targaryens, the Riverlands knew peace they had not had for centuries, if ever. But like all good things, sooner of later it all goes to shit and their shit had a name: Aerys II Targaryen. Westeros has had its share of Mad Kings, but usually they had the sense not to bully more than one powerful house at a time. Aerys soon blundered into a triple alliance: The North, Stormlands and Vale rose against him, but most of the blood was spilled in the Riverlands. Hoster Tully guaranteed that by marrying his daughter to Eddard Stark, the Warden of the North. At least Hoster did not send her to Robert. So the Riverlands joined that war against the Mad King and it was on one of their rivers that Prince Rhaegar died, sealing the fate of his dynasty.
Robert was a great soldier and a horrible king. Drinking and whoring are their own brand of madness when you sit on a throne that everybody wants. He died and another war started. Again the armies marched, again the Riverlands burned. If Westeros is not careful pretty soon its people will grow some sense and abandon itself for a safer realm, like the Dothraki Sea. Blackfish jokes, of course. The Riverlands are their home and gods help them, they love it. Still as they say "the king eats and the hand takes the shit". The same is true of the Riverlands: the Seven Kingdoms piss and the Riverlands change clothes.
- Balerion (not mentioned by name)
- King Aegon I Targaryen, the "Conquerer"
- Queen Rhaenys Targaryen (not mentioned by name)
- Queen Visenya Targaryen (not mentioned by name)
- Lord Edmyn Tully
- King Harren Hoare,the "Black" (mentioned)
- King Aerys II Targaryen, the "Mad King" (mentioned)
- Lord Hoster Tully
- Lady Minisa Tully (not mentioned by name)
- Ser Brynden Tully
- Lady Catelyn Tully (not mentioned by name)
- Lady Lysa Arryn (not mentioned by name)
- Lord Eddard Stark (mentioned)
- Prince Rhaegar Targaryen
- King Robert Baratheon
- House Tully
- House Mudd
- House Durrandon
- House Hoare
- House Botley
- House Blacktyde
- House Targaryen
- House Mallister
- House Blackwood
- House Bracken
- House Frey
- House Whent
- House Arryn
- House Baratheon
- House Stark
- The Riverlands
- The Westerlands (mentioned)
- The Reach (mentioned)
- The Vale of Arryn (mentioned)
- The North (mentioned)
- The Stormlands (mentioned)
- Dothraki Sea (mentioned)
- Dawn Age
- War of Conquest
- Robert's Rebellion
- War of the Five Kings
- Iron Throne (not mentioned by name)