Vivian Cerwyn

Vivian Cerwyn 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
Vivian married Cleos Umber, with whom she had a daughter, Katrina. Katrina later married Joseth Umber and had two sons, Maynard and Cedric.

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

Reference

 * "A Golden Crown"