The long line of mythic pagan kings of Ireland terminates with a group of three monarchs who succeeded each other, and are each said to have made extensive conquests beyond the bounds of their island kingdom. The first of these is Crimthan Mor mac Fidhaig, of the line of Heber, who reigned from 366 to 378, and is said to have extended his sway over Alban, Britain, and Gaul. Of him one of the oldest of the Irish documents, Cormac’s Glossary, says, under the word Mugeime, ‘that is the name of the first lapdog that was in Ireland. Cairbre Musc, son of Conaire, brought it from the east from Britain, for when great was the power of the Gael on Britain, they divided Alban between them into districts, and each knew the residence of his friend, and not less did the Gael dwell on the east side of the sea, as in Scotia or Ireland, and their habitations and royal forts were built there. Hence is called _Duin Tradui_, or the triple-fossed fort of Crimthan Mor, son of Fidach, king of Erinn and Alban to the Ictian Sea.’[132] His successor was Niall Mor, or the great, who reigned from 378 to 405. He also extended his conquests over Alban, Britain, and Gaul, and was slain at the mouth of the Loire on the shore of the Ictian Sea. He was termed Niall naoighialla, or ‘of the nine hostages,’ as he received hostages from nine nations which he had subjected to his rule. The last of these great conquerors was Dathi, who reigned from 405 to 428. He, too, extended his conquests over Alban, Britain, and Gaul, and was killed by a flash of lightning at _Sliabh Ealpa_, or the foot of the Alps.[133] He is said, in another document, to have been king of Erinn, Alban, Britain, and as far as the mountains of the Alps, where he went to revenge the death of his predecessor Niall, and was said by some to have been slain by the same arrow which killed the latter. His body was brought back to Erinn by his son, who gained nine battles by sea and ten by land by means of it, for when they exhibited the body they crushed their foes. Dathi is said to have fought many battles in Alban, viz., the battle of Magh Circain and the battle of Srath.[134] A tale called ‘The Expedition of Dathi to the Sliabh n-Ealpa’ gives the following account of his invasion of Scotland:—‘He invites all the provincial kings and chiefs of Erinn to a great feast at Tara, and there decides upon making an expedition into Alban, Britain, and Gaul, following the foot-steps of his predecessors Crimthan Mor and Niall. His fleet assembles at _Oirear Caoin_, probably Donaghadee, where he embarks with his troops and sets sail for Alban. Immediately upon his landing Dathi sends his Druid to Feredach Finn, king of Alban, who was then at his palace of ‘Tuirrin brighe na Righ,’ calling on him for submission and tribute, or an immediate reason to the contrary on the field of battle. The king of Alban refused either submission or tribute, and accepted the challenge of battle, but