IV. (c. 1141-1165) was the eldest son of Henry, earl of Huntingdon (d. 1152), son of King David I., and succeeded his grandfather David as king of Scotland in 1153. He is called the "Maiden," and died unmarried on the 9th of December 1165.
See E. A. Freeman, The Norman Conquest, vols. iv. and v. (1867-1879), and The Reign of William Rufus (1882); W. F. Skene, Celtic Scotland (1876-1880); E. W. Robertson, Scotland under her Early Kings (1862); and A. Lang, History of Scotland, vol. i. (1900).