Black Wings, Swift Words
Black Wings, Swift Words is a book written by Archmaester Walgrave. There is a passage in the book where Walgrave goes into detail about the folly of Baelor the Blessed in trying to replace delivery ravens with doves.
The title is a reference to the common saying regarding messages delivered through ravens: "Dark wings, dark words."
- The World of Ice & Fire, The Targaryen Kings: Baelor I.