Ser Edmure looked at his insistent father and had no choice but to follow him over. White-bearded Duke Hoster picked up his pen with trembling hands. His handwriting on the paper was somewhat distorted, but the contents remained clear.
There were three letters. Though their contents were simple, they carried tremendous weight. The first severed his relationship with Lysa, the second declared House Frey in rebellion, and the third sought House Frey's aid for Riverrun.
"Do you understand?" Duke Hoster asked Ser Edmure.
"Yes." Ser Edmure nodded firmly and put the letters away.
"Good. Now let my son read them aloud. The contents of these letters must remain strictly confidential. I respect you all as knights of the Seven Kingdoms, and I ask you to protect Riverrun and my son." Duke Hoster nodded. "I wrote these while my mind was clear. There is nothing false in them. If my mind grows confused later, please take these three letters as my true wishes."
Everyone nodded. Judging by Hoster's condition, it might not be long before his mind became confused. This was a way of entrusting his son to their care.
"Begin, Edmure." Duke Hoster gasped for breath.
"The first letter." Edmure began reading, his voice thick with tears. "My younger daughter, Lysa Tully, behaved perversely even as a child. After reaching adulthood, she further disregarded the proper conduct of a noble lady, tarnishing the family's name and dishonoring its reputation. The bonds between parent and child are hereby severed. Family, duty, honor. As her liege lord and her father, I am deeply ashamed. Before the Old and New Gods, I hereby sever my relationship with Lysa as father and daughter and banish her from House Tully forever."
In truth, the lords of the Trident had many grievances over Lysa Arryn's refusal