Maesters
Maesters are members of the Order of Maesters, a scholarly and medical guild that serves the noble houses of Westeros and beyond. They are trained as physicians, scientists, librarians, tutors, and advisors, and are often called upon to interpret history, collect knowledge, and provide medical care. Maesters take vows of celibacy and service, renounce noble titles and family ties, and pledge to act for the good of the realm rather than for personal power. They are expected to avoid entanglement in political affairs, though they may counsel rulers and negotiate technical solutions when asked.
The backbone of the order is the Citadel in Oldtown, where novices study for years under Archmaesters
Maesters serve houses by providing education, writing and copying manuscripts, preserving records, and offering medical care