From A Wiki of Ice and Fire
Hornwood is a castle in the North and the seat of House Hornwood. It is located between the Dreadfort and White Harbor.
A Clash of Kings
After Ramsay Snow kidnaps and forcibly marries the widowed Lady Donella Hornwood, Lord Wyman Manderly seizes Hornwood to prevent it from falling into Ramsay's hands.
References and Notes