Lord John Johnstone of that Ilk

John Johnstone, the eldest son of Adam, was progenitor of the Annandale branch.

John was present at the battle of Arkinholm, 1 May 1455. He took part against the Douglases, and in the royal expedition against their castle of Threave in Galloway.

He was engaged as a commander of Scottish Royalist forces in the Battle of Lochmaben, 22 July 1484. http://en.wikipedia.org/wiki/Battle_of_Lochmaben_Fair

Adam's son supported King James II of Scotland in putting down the Clan Douglas. They won their lands of Buittle and Sannoch near Threave Castle as a reward.

John's offspring would become the main chief Johnstone family.