House Harroway is an extinct noble house of the Riverlands. Their sigil was per bend sinister orange and black rayonne, a castle countercharged.
In the books
In the A Song of Ice and Fire novels, House Harroway's backstory is the same. There is a town, called Lord Harroway's Town, that is named after a former lord of the house.
- House Harroway at A Wiki of Ice and Fire (spoilers from the books)