Már tells that Ulaidh was extended south to the Delvin River as an éraic-fine paid to Fergus mac Léti, King of Ulaidh. In the legendary history-cycle tales Cormac mac Airt "is stated to have been deprived of the kingship [of Tara] and the eight-century saga of the battle of Crinna tells how with the help of Tadc mac Céin he drove the Ulaid back from the Boyne and was restored to the throne. ... The tale particularly refers to the Ciannachta, named from Tadc's father Cian, who occupied territory on both banks of the lower Boyne. Cormac promised Tadc as much land as his chariot could encircle in a day, but bribed the charioteer to exclude Tara as Tadc lay unconscious from the wounds he sustained". Whatever the origin myth by historical times, in the sixth century, the tribal grouping known as Ciannachta Breg were in place between Annagassan and Dublin centering on Duleek, the stone-church of St. Cianán. According to the Annals of Ulster they were defeated in 535 by Túathal Máelgarb at Luachair Mór eitir dá inber (... between two estuaries) a place between the Boyne and the Nanny, or Delvin River now the townland of Lougher west of Duleek. The Ciannachta of this area, south of the Boyne and north of the Nanny Water, came under the direct control of the Síl nÁedo Sláine in the seventh century. This included the area of Tuath Inbhir i mBregaib. Over time the territory passed to the Clann Cholmáin Kingdom of Meath. The Ciannachta were subject to their own bishop at Duleek from the fifth century until the see was subsumed by the Diocese of Meath in the late twelfth century. Later history The main surviving historic monuments in the area are a head and base of a sandstone high cross found at Colp, the head now in the Church of Ireland church at Julianstown, the Maiden Tower, built in the sixteenth century (see above), and the ruined tower-house castle at Donacarney Cross. Another castle previously stood in Mornington townland beside Colp as part of the medieval settlement cluster. Nothing now remains of it above ground. Mornington was separated from Colp in the early Norman period and given the status of a borough. The separate designation was in use by at least 1182 when Hugh de Lacy, Lord of Meath, ten years following his enfeoffment by Henry II with the