After flying past Harrenhal and following the Trident northwest, Danyla arrived near Riverrun on dragonback just as noon approached.
Influenced by the story of Game of Thrones, Danyla had an instinctive dislike of House Frey of Riverrun.
House Frey was one of the younger houses in Westeros. Roughly six centuries earlier, its founder had been granted lands and a title.
That founder of House Frey had been a man of foresight. He decided to build a bridge across the Green Fork, a tributary of the Trident, and began construction. His grandson eventually completed the bridge and built wooden forts at either end.
Over the generations that followed, the Freys gradually replaced the timber with stone and joined the castles and bridge into a single complex, naming it "The Twins."
A tall tower stood at the center of the bridge connecting the two castles. Named Riverwatch Tower, it commanded the river and road with arrow slits, murder holes, and iron portcullises.
Thanks to the Twins' vital strategic position and strong fortifications, House Frey could charge substantial tolls to those crossing the river, building its fortune in the process.
House Frey soon became one of the richest and most powerful houses along the Trident. Its rapid rise in status also earned it the scorn of other houses, who regarded the Freys as upstarts.
After the War of Conquest, House Frey and the other lords of the Riverlands swore allegiance to House Tully. During the Dance of the Dragons, House Frey supported the Blacks.
Later in history, House Frey grew rapidly under Marquess Walder's rule, thanks to his numerous offspring.
They grew wealthy by charging steep bridge tolls, for the Twins offered the only river crossing within several days' travel. Wealthy and numerous, the Freys were among House Tully's most powerful vassals, capable