Theron

Maester Theron, born Theron Pyke, is an unseen character in Game of Thrones. He was a maester born on the Iron Islands.

Biography
Theron suggested the legendary Deep Ones as the builders of the ancient fortress on which the Hightower of Oldtown stands. However, this theory holds little support.

Reference

 * "Oldtown (Histories & Lore)"