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Causantín mac Cuiléin (anglicised Constantine III) (before 971–997) was king of Scots from 995 to 997. He was the son of Cuilén mac Iduilb.

Causantín became king upon the death of Cináed mac Maíl Coluim, supposedly killed by Finnguala, daughter of Cuncar, Mormaer of Angus, a killing with which Causantín is associated in several accounts. John of Fordun, perhaps confusing him with Eógan II of Strathclyde, known as "the Bald", refers to Causantín the Bald. He reigned for eighteen months according to the Chronicle of the Kings of Alba.

The Annals of Tigernach report that he was killed in a battle between the Scots in 997. His death is placed by the Chronicle at Rathinveramond at the mouth of the Almond where it meets the River Tay near Perth. This appears to have been a royal centre, close to Scone and Forteviot, as Domnall mac Ailpín is said to have died there in 862. His killer is named as Cináed mac Maíl Coluim, probably in error for either Cináed mac Duib, who became king on Causantín's death, or perhaps for Máel Coluim mac Cináeda.

Causantín is not known to have any descendants and he was the last of the line of Áed mac Cináeda to have been king.

For primary sources see also External links below.

• Anderson, Alan Orr, Early Sources of Scottish History A.D 500–1286, volume 1. Reprinted with corrections. Paul Watkins, Stamford, 1990. ISBN 1-871615-03-8
• Duncan, A.A.M., The Kingship of the Scots 842–1292: Succession and Independence. Edinburgh University Press, Edinburgh, 2002. ISBN 0-7486-1626-8
• Smyth, Alfred P. Warlords and Holy Men: Scotland AD 80-1000. Reprinted, Edinburgh: Edinburgh UP, 1998. ISBN 0-7486-0100-7

• CELT: Corpus of Electronic Texts at University College Cork includes the Annals of Ulster, Tigernach, the Four Masters and Innisfallen, the Chronicon Scotorum, the Lebor Bretnach (which includes the Duan Albanach), Genealogies, and various Saints' Lives. Most are translated into English, or translations are in progress.
• (CKA) The Chronicle of the Kings of Alba

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Monarchs of Scotland (Alba)

	Traditional List of Monarchs of the Picts Legendary Monarchs: Drest I • Talorc I • Nechtan I • Drest II • Galan • Drest III • Drest IV • Gartnait I • Cailtram • Talorc II • Drest V • Galam • Bridei I • Gartnait II • Nechtan II • Cinioch • Gartnait III • Bridei II • Talorc III • Talorgan I • Gartnait IV • Drest VI • Bridei III • Taran • Bridei IV • Nechtan IV • Drest VII • Alpín I • Óengus I • Bridei V • Cináed I • Alpín II • Talorgan II • Drest VIII • Conall • Caustantín • Óengus II • Drust IX • Uen • Uurad • Bridei VI • Ciniod II • Bridei VII • Drest X
something	Traditional List of Monarchs of the Scots Kenneth I • Donald I • Constantine I • Áed • Giric • Donald II • Constantine II • Malcolm I • Indulf • Dub • Cuilén • Kenneth II • Constantine III • Kenneth III • Malcolm II • Duncan I • Macbeth • Lulach • Malcolm III • Donald III • Duncan II • Donald III • Edgar • Alexander I • David I • Malcolm IV • William I • Alexander II • Alexander III • First Interregnum • John • Second Interregnum • Robert I • David II • Robert II • Robert III • James I • James II • James III • James IV • James V • Mary I • James VI* • Charles I* • Charles II • The Covenanters • The Protectorate • Charles II* • James VII* • Mary II* • William II* • Anne* * also monarch of Ireland and England