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Master of Laws is an important position in the government of the Seven Kingdoms. The holder is a member of the monarch's small council, the inner cabinet of the realm. The Master of Laws is responsible for advising the king on legal matters, managing the dungeons, and supervising the King's Justice.
At the start of the TV series, Renly Baratheon is Master of Laws, during the reign of his older brother, King Robert Baratheon. Renly abandons the title in order to lay claim to the Iron Throne himself following Robert's death. The post remains vacant.
In the A Song of Ice and Fire novels, given that Renly was only a child when his eldest brother Robert was crowned king, he was only appointed as Master of Laws a few years before the beginning of the narrative, after he had come of age. It is not stated which person (or persons) served as Master of Laws under Robert before him.