Caintigern (Kentigerna) (d. 734), anchoress of Loch Lomond and saint in the Irish tradition, was daughter of Cellach Cualann (qv), Uí Máil overking of Leinster, but it is not clear which of his successive wives was her mother. She had at least five brothers or half-brothers, none of whom are styled king in the record, but all of whom were clearly prominent dynasts of Uí Máil. She also had three sisters, two of whom were married into the dynasties of Uí Dúnlainge and Síl nÁedo Sláine.
According to the Breviary of Aberdeen, Caintigern married a certain Feriacus, regulus (subking) of Monchestree. It seems reasonable to identify Feriacus with a Dál Riata dynast, one Feradach grandson of Artúr, the earliest historically attested Artúr (slain in battle with the Miathi, c.595). A marriage between Caintigern and Feradach could well explain how the rare and peculiarly north-British name Artúr occurs several generations later in the genealogy of Uí Máil and subsequently in that of Uí Dúnlainge.
Feradach was in religious orders; in 697 he signed the list of guarantors to the Law of Adomnán (qv) along with Cellach Cualann. Caintigern is said to have had several children, including a son, Fáelán (qv) (d. early 8th cent.); significantly, a church at Glendalough was dedicated to a saint of this name. It appears that, after her husband's death, Caintigern followed a religious vocation, ending her life as an anchoress. The Breviary of Aberdeen associates Caintigern, her alleged son Fáelán, and the priest Comgán (traditionally believed to have been her brother) with several sites in south-west Scotland. In particular, she is identified with Inchcailloch (Nun's Island) in Loch Lomond, which may represent her final place of retreat. Her cult is also associated with Turriff, Siracht, and Strathfillan, while Kilchintorn (south of Loch Duich) perhaps also preserves a dedication to her. Caintigern died in 734, probably on 7 January, under which date she is commemorated in the Scottish calendar.