asoiaf - Artys Arryn

"A Feast for Crows - Lord Robert Arryn (Sweetrobin)'s favorite stories are those of the Winged Knight. He demands three stories from Sansa before he agrees to prepare for his departure from the Eyrie.

Among the hundreds of stories told about him, the Winged Knight is said to have flown upon a huge falcon and had armies of eagles at his command. He won the the Vale by slaying the Griffin King atop the Giant's Lance.^{" From A Song of Ice and Fire wiki}