Aerys I Targaryen

Aerys I Targaryen is an unseen character in Game of Thrones. Hhe is not expected to appear in the series, being long dead by the time it begins.

Background
Aerys Targaryen was the first of his name to sit the Iron Throne and the thirteenth King of the Targaryen dynasty. He was the son of King Daeron the Good and Queen Myriah and succeeded his father after he perished in the Great Spring Sickness. Per the Targaryen tradition, he took his own sister Aelinor as his wife. His other brothers were Baelor, Rhaegel, and Maekar, who would succeed him on the Iron Throne

Season 1
Aerys, along with his brothers and sister, is mentioned in the House Targaryen's entry of the book The Lineage and Histories of the Great Houses of the Seven Kingdoms.

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.