Spoilers

Towards the end of book five of A Song of Ice and Fire, Jon Connington, Prince Aegon Targaryen, and the Golden Company have returned to Westeros and taken the castle of Griffin's Roost on the Cape of Wrath near Storm's End. Haldon the Halfmaester has been looking over parchments in the maester's tower to learn what is the state of the game in Westeros. Connington asks him

"Have those parchments told you anything of use?"

"Oh, much and more, my lord." Haldon gave him a thin smile. "The Lannisters make enemies easily but seem to have a harder time keeping friends. Their alliance with the Tyrells is fraying, to judge from what I read here. Queen Cersei and Queen Margaery are fighting over the little king like two bitches with a chicken bone, and both have been accused of treason and debauchery. Mace Tyrell has abandoned his siege of Storm's End to march back to King's Landing and save his daughter, leaving only a token force behind to keep Stannis's men penned up inside the castle."

Connington sat. "Tell me more."

"In the north the Lannisters are relying on the Boltons and in the riverlands upon the Freys, both houses long renowned for treachery and cruelty. Lord Stannis Baratheon remains in open rebellion and the ironborn of the islands have raise up a king as well. No one ever seems to mention the Vale, which suggests to me that the Arryns have taken no part in any of this."

George R.R. Martin, "A Dance With Dragons,"  page 808