Alerie Tyrell

Alerie Tyrell, née Hightower, is an unseen character in Game of Thrones.

Background
Alerie Tyrell is a daughter of House Hightower. She is the wife of Mace Tyrell, the Lord of Highgarden and the head of House Tyrell. They had two children, Loras and Margaery. She is the elder sister of Lynesse Hightower, the estranged wife of Ser Jorah Mormont.

In the books
In A Song of Ice and Fire, her family remains the same, except she and Mace have two other sons, named Willas and Garlan. She is described as tall and dignified and has long silver hair (presumably from age and not Valyrian heritage). She is younger than her husband. Alerie is actually present in King's Landing with most of the other Tyrells. She attended the Purple Wedding and comforted Margaery when her new husband was poisoned. She remained through Tywin's funeral before leaving King's Landing with Olenna and Garlan. At a function, she refers to Olenna as "mother", but Olenna snaps that she would have remembered giving birth to Alerie, and that she is "only to blame" for Alerie's husband.