Regan Karstark

Regan 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 Umber, and an ancient ancestor of the Greatjon.

Background
Regan Karstark is an early member of House Umber. She married Commard Karstark and bore him five sons.

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

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