|Book||The World of Ice & Fire (mentioned)|
Wyllis journeyed to Hardhome on a Pentoshi trader and established himself among the Free Folk, under the protection of the chieftain Gorm the Wolf, to write down their customs while practicing as a healer and counselor. When Gorm was murdered in a drunken brawl, Wyllis found himself in mortal danger and fled back to Oldtown, where he wrote Hardhome: An Account of Three Years Spent Beyond-the-Wall among Savages, Raiders, and Woods-witches. The year after the illuminations were done, Wyllis vanished. It was said in the Citadel that he was last seen at the docks, looking for a ship that would take him to Eastwatch-by-the-Sea
- The World of Ice & Fire, The Wall and Beyond: The Wildlings.