Hollys Umber

Lady Hollys Umber, née Tallhart, 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.

Background
Hollys was born to Tyrek and Petra Tallhart and married Gareth Umber, with whom she had five children.

Season 1
She is mentioned in The Lineages and Histories of the Great Houses of the Seven Kingdoms.

Reference

 * "A Golden Crown"