Mara Karstark

Mara Karstark is an unseen character in Game of Thrones. She is not expected to appear in the series, being long dead by the time it starts. She is one of the earliest recorded members of House Karstark, and an ancient ancestor of Lord Rickard Karstark.

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

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