Gareth Umber

Gareth Umber is an unseen character in Game of Thrones. He is not expected to appear in the series, being long dead by the time it starts. He is one of the earliest recorded members of House Umber, and an ancient ancestor of the Greatjon.

Background
Gareth Umber is an early member of House Umber. He was the fourth born son of Lord Hothor Umber and his wife Lady Amarylis Umber.

Season 1
He has an entry in The Lineages and Histories of the Great Houses of the Seven Kingdoms.

In the books
Gareth Umber is referenced only in the TV adaptation of A Song of Ice and Fire and has no corresponding counterpart in the books.