Myriah Martell

Myriah Martell is an unseen character in Game of Thrones. She is not expected to appear in the series, being long dead by the time it begins.

Background
Myriah Martell was a Dornish Princess of the House Martell of Sunspear. She married King Daeron II Targaryen and became the mother of Baelor, Aerys, Rhaegel, and Maekar; and one daughter, Aelinor.

Season 1
Queen Myriah, along with her progenie, is mentioned in the House Targaryen's entry of the book The Lineage and Histories of the Great Houses of the Seven Kingdoms. He's described as purple blue of eyes, silver of hair and round of shoulders.

In the books
In the A Song of Ice and Fire novels, Queen Myriah married Daeron II as part of the marriage pact that brought Dorne under the rule of the Iron Throne.