Brook in the parish of Heywood, north of Westbury in Wiltshire, England, is an historic estate. It was the seat of Robert Willoughby, 1st Baron Willoughby de Broke (c. 1452 – 1502), KG, an important supporter of King Henry VII, whose title unusually incorporates the name of his seat,[1] in order to differentiate him from his ancestors Barons Willoughby of Eresby, seated at Eresby Manor near Spilsby in Lincolnshire. A medieval wing survives of the mansion house known as Brook Hall, a Grade I listed building which stands near the Biss Brook.