The Warden of Westmarch was a hereditary title in the Shire granted to the keepers of the Westmarch who dwelt by the White Towers on the slopes of the Tower Hills at the Undertowers, by Peregrin I, the thirty-second Thain of the Shire in SR 1462. The Wardens held the famous Red Book and were all members of the Fairbairns family (or the Fairbairns of the Towers) to which Fastred of Greenholm was the first.