The Riverlands

The center-most region of Westeros, and the crossroads between several kingdoms, the Riverlands consists of rich, fertile, and populous areas around the Three Forks of the Trident and the northern Blackwater Rush. Despite it's prosperous nature in peace time, the Riverlands have been a frequent battleground due to a lack of natural defenses and it's central position.

Some argue that the Riverlands has suffered the most since the Second War of Conquest, as the fallout of the War of the Five Kings had created several roaming bands of outlaws and thieves, which took years to root out. The Great Famine, the Half-Blood Incursion, and the Scarlet Winter are constant reminders of the Riverlands vulnerability.

The Riverlands is ruled by House Tully of Riverrun.

300-301 AC - The Second War of Conquest
During the Second War of Conquest, The Riverlands was largely divided under the rule of House Baelish of Harrenhal, as an immediate aftermath of the War of the Five Kings. Edmure Tully, Lord of Riverrun, atainted of his seat, was freed by his uncle, the Blackfish, on a raid of a Lannister caravan intent on bringing him to Casterly Rock. Under him, the Riverlands began to unify against House Frey of the Twins, which had split into civil war upon Lord Walder's death.

Lord Edmure eventually reached out to Aegon Targaryen and was successful in being renamed to his seat, and aided Aegon in reconquering the Riverlands. The Battle of Oldstones was the last major battle in the Riverlands and marked the end of major conflict in the region for over a decade.

315 AC - The Year of False Banners
With the rise of the Vulture King in the south, and as other rebellions sprung up throughout the Seven Kingdoms, Black Walder Frey made a bold move against House Tully, his ultimate motive to kill Lord Edmure and destabilise the Riverlands. Through clever use of deception and money, the Lord of House Frey brought three powerful bandit groups to fold, and employed them against the Lord of the Riverlands.

Three years of clever tracking and planning were all that was required to root out the bandit groups. Though Black Walder's complicity was never discovered, it was revealed by his son and heir shortly after his death a decade later.