From A Wiki of Ice and Fire
|Book||The World of Ice & Fire (mentioned)|
According to Archmaester Haereg's History of the Ironborn, Torwyn swore a blood oath with Ser Aegor Rivers, but Lord Greyjoy betrayed Bittersteel to his enemies during one of the Blackfyre Rebellions.[N 1]
- The World of Ice & Fire, The Iron Island: The Old Way and the New.