Constantine, son of Cuilén (Middle Gaelic: Causantín mac Cuiléin; Modern Gaelic: Còiseam mac Chailein), known in most modern regnal lists as Constantine IIIUntil the Victorian era, Constantine, son of Áed was listed as "Constantine III of Scotland", and this Constantine as "Constantine IV". Since then, revised historical opinion has removed Causantín mac Fergusa, previously titled "Constantine I of Scotland", from the traditional list of Scottish monarchs, leading to this Constantine being retitled as "Constantine III". ( – 997), was king of Alba (Scotland) from 995 to 997. He was the son of King Cuilén. John of Fordun calls him, in Latin, Constantinus Calvus,Skene, Coronation Stone, p. 93 which translates to Constantine the Bald. (Middle Gaelic: Causantín In Maol)Williams, Smyth, and Kirby, A Biographical Dictionary of Dark Age Britain: England, Scotland, and Wales, c. 500–1050, p. 89 Benjamin Hudson notes that insular authors from Ireland and Scotland typically identified rulers by sobriquets, noting for example the similarly named Eugenius Calvus (Owain Foel), an 11th century King of Strathclyde.Hudson, A Biographical Dictionary of Scottish Gaze, p. 50

Background The Scottish monarchy of this period based its succession system on the rule of tanistry. All adult male descendants of previous monarchs were eligible for the throne. The kingship regularly switched from one line of royal descendants to another, though they were all closely related. Constantine was able to rise to the throne, despite his cousin and predecessors having a son of his own. The next two kings (Kenneth III and Malcolm II) were his cousins and killed their respective predecessor to gain the throne. The succession rule had the benefit of ensuring that there would always be an adult king on the throne, avoiding the usual problems of minority reigns. The various kings had their lands and power bases in different areas of Scotland, preventing any single region from claiming full domination of the others. This may have helped the country avoid significant secession movements. The downside was that any single king had to face adult rivals for the throne. His kinsmen had their own ambitions and would not wait for his death from natural causes to achieve them. The succession was often decided through acts of warfare and murder, resulting in early deaths and high casualty rates in the extended royal family.Mitchison, A History of Scotland, p. 13

During the 10th century, there were dynastic conflicts in Scotland between two rival lines of royalty. One descended from Causantín mac Cináeda (Constantine I, reigned 862–877), the other from his brother Áed mac Cináeda (reigned 877–878). Constantine III belonged to the second line. His royal ancestors included Áed himself, Constantine II of Scotland (reigned 900–943), Indulf (reigned 954–962), and Cuilén (reigned 967–971). Amlaíb of Scotland (reigned 973–977) was his paternal uncle.Smyth, Warlords and Holy Men: Scotland AD 80–1000, p. 223-224 The alternation between the two royal lines seems to have been peaceful for a long time; Alfred P. Smyth regards this early phase as "a century of kingly coexistence". The armed conflict between the lines seems to have started in the 960s when Cuilén challenged the rule of his cousin Dub, King of Scotland (962–967). The initial motivation behind the conflict is unclear. Smyth speculates that control over the Kingdom of Strathclyde might have been a major factor.

Reign According to John of Fordun (14th century), Kenneth II of Scotland (reigned 971–995) attempted to change the succession rules, allowing "the nearest survivor in blood to the deceased king to succeed", thus securing the throne for his own descendants. He reportedly did so to specifically exclude Constantine (III) and Kenneth (III), called Gryme in this source. The two men then jointly conspired against him, convincing Lady Finella, daughter of Cuncar, Mormaer of Angus, to kill the king. She reportedly did so to achieve personal revenge, as Kenneth II had killed her own son. Entries in the Chronicles of the Picts and Scots, collected by William Forbes Skene, provide the account of Finnguala killing Kenneth II in revenge, but not her affiliation to Constantine or his cousins. These entries date to the 12th and 13th centuries.The name of Cuncar's daughter is given as Fenella, Finele or Sibill in later sources. John of Fordun credits Constantine III (Causantín mac Cuilén) and Kenneth III (Cináed mac Duib) with the planning, claiming that Kenneth II planned to change the laws of succession. See ESSH, pp. 512–515. The Annals of Ulster simply record "Cinaed son of Mael Coluim [Kenneth, son of Malcolm], king of Scotland, was deceitfully killed", with no indication of who killed him.Annals of Ulster, online translation. Entry U995.1

In the account of John of Fordun, Constantine the Bald, son of king Cullen and Gryme were "plotting unceasingly the death of the king and his son". One day, Kenneth II and his companions went hunting into the woods, "at no great distance from his own abode". The hunt took him to Fettercairn, where Finella resided. She approached him to proclaim her loyalty and invited him to visit her residence, whispering into his ear that she had information about a conspiracy plot. She managed to lure him to "an out-of-the-way little cottage", where a booby trap was hidden. Inside the cottage was a statue, connected by strings to a number of crossbows. If anyone touched or moved the statue, he would trigger the crossbows and fall victim to their arrows. Kenneth II gently touched the statue and "was shot through by arrows sped from all sides, and fell without uttering another word." Finella escaped through the woods and managed to join her abettors, Constantine III and Gryme. The hunting companions soon discovered the bloody king. They were unable to locate Finella but burned Fettercairn to the ground.Skene, John of Fordun's Chronicle of the Scottish nation, Book IV, Chapters XXXII-XXXIV (32–34), pages 165–169 Smyth dismisses the elaborate plotting and the mechanical contraption as mere fables, but accepts the basic details of the story, that the succession plans of Kenneth II caused his assassination.Smyth, Warlords and Holy Men: Scotland AD 80–1000, p. 224–225 Alan Orr Anderson raised his own doubts concerning the story of Finella, which he considered "semi-mythical". He noted that the feminine name Finnguala or Findguala means "white shoulders", but suggested it derived from "find-ela" (white swan). The name figures in toponyms such as Finella Hill (near Fordoun) and Finella Den (near St Cyrus), while local tradition in The Mearns (Kincardineshire) has Finella walking atop the treetops from one location to the other. Anderson thus theorized that Finella could be a mythical figure, suggesting she was a local stream-goddess.Anderson, Early sources of Scottish history, A.D. 500–1286, p. 515 A later passage of John of Fordun mentions Finele as mother of Macbeth, King of Scotland (reigned 1040–1057), but this is probably an error based on the similarity of names. Macbeth was son of Findláech of Moray, not of a woman called Finella.Skene, John of Fordun's Chronicle of the Scottish nation, Book IV, Chapters XLIV (44), page 180

The narrative of John of Fordun continues on to the reign of Constantine III. The day following the death of Kenneth II, Constantine the Bald, son of King Cullen usurped the throne. He had reportedly won the support of a number of nobles. The throne was also claimed by his cousin Malcolm II, son of Kenneth II, resulting in long-lasting division of the Scottish population, and conflict. Constantine III reigned for a year and a half [18 months], "continually harassed by Malcolm and his illegitimate uncle, named Kenneth, a soldier of known prowess, who was his unwearied persecutor, and strove with his whole might to kill him, above all others." The Chronicle of the Kings of Scotts (Cronica Regum Scottorum, 12th century) shortens the reign to one year and four months (16 months).Skene, Chronicles of the Picts and Scots, p. 131 This source was a king-list compiled during the reign of William the Lion (reign 1165–1214), the last king mentioned in it. It has survived as the fifth text of the Poppleton manuscript.Woolf, From Pictland to Alba, 789–1070, pp. 88–89 The existence of Kenneth, illegitimate uncle to Malcolm II, is not recorded in older sources. John of Fordun had apparently listed this Kenneth as an illegitimate son of Malcolm I of Scotland. Skene noted that this could be an error, and suggested that Kenneth, son of Malcolm was actually Kenneth III (Kenneth, son of Dubh).Skene, Chronicles of the Picts and Scots, Preface, pp. CXLIV-CXLV (144–145) Kenneth III was a grandson of Malcolm I, rather than a son. Robert Shaw also doubted Kenneth II having a brother, illegitimate or not, who was also named Kenneth, pointing out that Malcolm I would have no reason to give the same name to two of his sons.Shaw, Historical origins. Appendix article: Critical Review of the Scottic or Gaelic History, pp. 18–19 Alex Woolf accepted the identification of Kenneth, son of Malcolm, with Kenneth III as a possible solution, but suggested a number of alternatives. Kenneth II himself was a Kenneth, son of Malcolm; his name could have been transferred to the killer of his successor by a faulty text. Or Kenneth, son of Malcolm, could be an accidental reversal of Malcolm (II), son of Kenneth. Or the killer could be a Kenneth, son of Malcolm who was not actually a member of the royal family.Woolf, From Pictland to Alba, 789–1070, pp. 221–222

The Annals of Tigernach report that Constantine was killed in a battle between the Scots in 997: "A battle between the Scots, in which fell Constantine son of Culannan, king of Scotland, and many others." Another entry of the same year reports the death of Máel Coluim I of Strathclyde, though it is unclear if the two deaths were connected.Annals of Tigernach, online translation. Entry T997.1 and T.997.3Anderson, Early sources of Scottish history, A.D. 500–1286, pp. 517–519 A Chronicle of the Scots and Picts entry adds a number of details. Constantine, son of Culen, was killed by Kenneth, son of Malcolm (see above) at Rathinveramon. Constantine's body was transported for burial to Iona. An entry in the Chronicle of Melrose describes "King Constantine, Culen's son, ... slain by the sword" at the mouth of Almond in Tegalere. Again the killer is reported as Kenneth, son of Malcolm. John of Fordun's narrative is more verbose. According to it, Constantine and Kenneth, son of Malcolm met one day in Laudonia (Lothian), by the banks of the River Almond. They engaged in battle, resulting in great slaughter on both sides and the death of both leaders. The guards of Constantine fled to Gryme (Kenneth III), "colleague" of their leader, allowing him to win the throne. However, news of the battle and its results reached Malcolm (II) in Cumbria. He learned of the death of his "uncle and the rest of his faithful friends", and returned to gather reinforcements for his cause — though he was defeated in his initial conflict against Gryme.