Cassana Baratheon

Cassana Baratheon is an unseen character in Game of Thrones. She is deceased when the events of the series begin and is not expected to appear in the series.

Cassana was the Lady of Storm's End and the wife of Steffon Barathron, the head of House Baratheon, one of the Great Houses of Westeros. They have three sons, Robert, Stannis and Renly Baratheon. She lived with her family in Storm's End.

Season 1
She has an entry in the The Lineage and Histories of the Great Houses of the Seven Kingdoms, as read by Eddard Stark.

In the books
In the Song of Ice and Fire novels, Cassana comes from House Estermont. She married Steffon Baratheon and bore him three sons as in the series. She accompanied him on a trip to Essos. Their ship, the Windproud, sank in Shipbreaker Bay within sight of Storm's End on their return voyage. Their bodies were never found.