Walter Scott of Harden lived in what 16th century tower house? 
Walter Scott of Harden: Walter Scott of Harden (before 1563 – 1629), also known as Auld Wat, was a notorious Border Reiver. Harden Castle: Harden Castle is a 16th century tower house, about 3.5 mi west of Hawick, Scottish Borders.
Harden Castle