House Hightower is a noble family from the fictional world of Westeros in the series "A Song of Ice and Fire" by George R.R. Martin. They are based in the city of Oldtown and are known for their wealth and influence. The Hightowers are recognized by their sigil, which features a white tower on a green field, symbolizing their stronghold and prominence in the region. The family has a long history of serving as stewards to the Targaryens and has produced several notable figures, including Maegor the Cruel and Aemon Targaryen. House Hightower is also known for its connection to the Citadel, the center of learning and knowledge in Westeros, where many maesters are trained.