House Caswell of Bitterbridge is a noble house from the Reach. Their seat is Bitterbridge, where the Roseroad meets the river Mander. Their blazon is a yellow centaur with bow on white. The Caswells carry the title Defender of the Fords.
Orbert Caswell served as Lord Commander of the Night's Watch.
During the Battle Beneath the Gods Eye in 43 AC, Lord Caswell joined Lords Merryweather and Peake in marching from the Reach to add their levies to King Maegor I Targaryen's host against Prince Aegon the Uncrowned. While Lords Merryweather and Caswell advanced against Aegon's host from the south, Maegor quickly killed his young nephew and the battle turned into a rout.
During the Dance of the Dragons, Tom Flowers, the Bastard of Bitterbridge, was one of the commanders of the blacks during the Battle on the Honeywine. He was burned alive by the dragon Tessarion when Prince Daeron the Daring joined the battle. Daeron began the sack of Bitterbridge after the death of Prince Maelor Targaryen. Lady Caswell hanged herself from her castle's gatehouse.
House Caswell fought for the Targaryens during the First Blackfyre Rebellion. Ser Kyle claimed to have saved the life of Lord Armond Caswell, Lord of Bitterbridge, during the rebellion. Armond's son, Lord Joffrey Caswell, faced Kyle in the Whitewalls tourney, unhorsing the knight in the first tilt.
Ser Cleyton Caswell was one of the suitors for Lady Rohanne Webber's hand.
Old Lord Caswell's son, Ser Lorent, took a gift longsword made by Bitterbridge's armorer for his own son, Rolly. Lorent was wounded by Rolly in anger, after which Rolly fled in exile for the Golden Company.
Lord Commander Orbert Caswell, known as the Black Centaur, who led the Night's Watch for nine years.
Tom Flowers, bastard of Bitterbridge, who fought in the Dance of the Dragons.
Lord Armond Caswell, Lord of Bitterbridge during the Blackfyre Rebellion.
Lord Joffrey Caswell, his son, Lord of Bitterbridge during the reign of Aerys I Targaryen.
Ser Cleyton Caswell, a knight.
Lord Caswell, the father of Lord Lorent Caswell.