Aemon Targaryen

Aemon Targaryen is a character in Game of Thrones. He is played by Peter Vaughan and debuts in the first season.

Aemon is the maester at Castle Black and is believed to be the oldest man in Westeros. He is a member of House Targaryen, being the grand-uncle to the deceased King Aerys II Targaryen abd the great-grand-uncle to Prince Viserys and Princess Daenerys. However, he renounced his house name on joining the order of maesters. He does not widely advertise his house name or lineage.

In the books
In the Song of Ice and Fire novels Aemon is a wise and learned counsellor to Lord Commander Jorah Mormont and other members of the Night's Watch. Despite being almost blind, he tends to the castle's ravens with the help of several assistants.