House Hightower of Oldtown is a powerful family from the South of Westeros who overshadow their liege lords, the Tyrells of Highgarden. They are one of the richest families in the realm, and the head of the House holds honorary titles such as Beacon of the South and Defender of the Citadel. The Hightowers in House of the Dragon come from an ancient line of independent monarchs who once ruled as kings of the High Tower.