||Although this article is based on canonical information, the actual name of this subject is pure conjecture.
This unnamed man
is a sworn brother of the Order of Maesters
, and is currently in service at Bear Island
where he advises Lady Lyanna Mormont
The maester is present when Jon Snow, Sansa Stark, and Davos Seaworth come to request fighting men from Bear Island. He counsels Lady Lyanna Mormont in hushed tones as she speaks with her visitors. Later, at the Stark loyalist camp, Sansa sees him unloading ravens from a wagon, giving her the idea to write for support from Petyr Baelish and the knights of the Vale.