 David II of Scotland granted a charter to Thomas de Cranston for all the lands of Cranston.The Clan Cranstoun prospered up to the late 16th century when they became involved in the volatile political situation of the time.In 1592 Thomas and John Cranstoun, both relatives of the chiefly family were among those accused of treason for assisting Francis Stewart, 5th Earl of Bothwell in his attack on Holyrood Palace.