Jasper Wylde

Jasper Wylde is an unseen character in Game of Thrones. He is not expected to appear in the show, being long dead by the time it begins. He was the Master of Laws during the reign of King Viserys I Targaryen and the Dance of the Dragons.

Biography
After the death of Viserys, the Small Council convened, at which point the Hand of the King Otto Hightower demanded that the matter of the succession be settled. Wylde and the other members of the council argued that Rhaenyra Targaryen had already been named Viserys' heir, but Criston Cole insisted that a son always comes first in the line of succession. The meeting lasted an entire night.

Reference

 * "The Dance of Dragons (Histories & Lore)"