Melessa Tarly

Melessa Tarly is an unseen character mentioned in the second season. Lady Melessa is the wife Lord Randyll Tarly of Horn Hill and mother of Samwell Tarly of the Night's Watch. She is a cousin of Selyse Florent, the wife of Stannis Baratheon, and Ser Imry Florent.

Season 2
Before leaving Craster's Keep, Samwell Tarly gives Gilly a thimble that once belonged to Lady Melessa. He explains that he used to read to her while she was sewing but that his father ended the practice when he found out. He reveals that the thimble is the only possession he has from her and that it was a gift given when he left for the Wall.

In the books
In the A Song of Ice and Fire novels Melessa Florent is a daughter of Alester Florent, head of House Florent and Lord of Brightwater Keep. She's the mother of Samwell and Dickon Tarly.