House Towers were granted the castle of Harrenhal after the extinction of House Harroway at the hands of King Maegor I Targaryen. House Towers died out after three generations. They were succeeded by House Strong.
After the extinction of the Harroways, Maegor decreed that the strongest of his knights would be granted the mighty castle of Harrenhal. Twenty three knights fought a melee in the streets of Lord Harroway's Town, with Ser Walton Towers winning.
Walton later died of the wounds that he had taken in gaining his prize and the house died out two years later.