who did robb stark marry in season 2
Robb Stark When his father leaves for King's Landing to be made King Robert Baratheon's Hand, Robb becomes acting Lord of Winterfell. After his father's arrest for presumed treason, he marches south with an army in attempt to free his father. To secure passage through the Green Fork at the vital crossing of the Twins, Robb consents to the marriage to one of Walder Frey's daughters or granddaughters negotiated by his mother Lady Catelyn Tully. After crossing the river, he surprises and destroys the Lannister army besieging Riverrun, capturing Jaime Lannister in the process. Upon hearing of his father's execution at King's Landing, Robb is crowned the King in the North by his bannermen, and the Riverlands lords also swear loyalty to him.