I don't know why I keep recommending books to you but there is an excellent history of the Border Reivers titked 'The Steel Bonnets' by George MacDonald Fraser who wrote the Flashman series.

He points out that in 1968 when Nixon was sworn in that on the podium were descendants of three reiving families, Nixon, Johnson and Graham.

The Armstrong name was common over the whole of Northumbria and the Scottish Borders. The Armstrongs became a powerful and warlike clan in Liddesdale and the Debatable Lands. Historian George Fraser Black lists Adam Armstrong in 1235 as being pardoned for causing the death of another man. Black also records Gilbert Armstrong, steward of the household of David II of Scotland, as ambassador to England in 1363.

http://borderreiverheritage.com/clan-armstrong/