Our principal source of information about the Circuit comes from a poem of undoubted authority and antiquity, written by one called Cormacan Eigeas, who accompanied Muircheartach on the expedition. It is one of the most remarkable poems of its age, not only in Gaelic, but in any language. It was translated more than forty years ago, and may be seen in the "Transactions" of the Royal Irish Academy; but it is not probable that even forty persons have ever read it, so little general interest has heretofore been taken in Gaelic literature or Irish history. For these reasons it cannot be uninteresting to give some extracts from it. It commences:
"O Muircheartach, son of the valiant Niall, Thou hast taken the hostages of Inis Fail, Thou hast brought them all into Aileach, Into the stone-built palace of steeds!
"Thou didst go forth from us with a thousand heroes Of the race of Eoghan of red weapons, To make the great Circuit of Ireland, O Muircheartach of the yellow hair!
"The day thou didst set out from us eastwards Into the fair province of Connor,[7] Many were the tears down beauteous cheeks Among the fair-haired women of Aileach."
Muircheartach carried off the King of Ulster; and, as the old chroniclers tell us, keeping his left hand to the sea, he fared to Dublin, then the greatest stronghold the Danes had, not only in Ireland but in the west of Europe. He did not have to fight the Danes of Dublin, although he had often fought them before, for their king, probably thinking that "discretion was the better part of valour," surrendered himself a prisoner. And here one of these inconsequential incidents is related, which no one but an ancient Irish poet would dream of mentioning. Muircheartach seems to have had no objection to make love to a Danish maiden, often as he had fought Danish men. Cormacan, the poet, tells us that they
"Were a night at fair Ath-cliath [Dublin]; It was not a pleasure to the foreigners: There was a damsel in the strong fortress Whose soul the son of Niall was; She came forth until she was outside the walls, Although the night was constantly bad."
Muircheartach then proceeded south-west from Dublin to Aillinn, and carried away the King of Leinster. He then made for Cashel, where the King of Munster lived. But Callachan, that was his name, showed fight, and Muircheartach's men threw off their leather cloaks and prepared to stand by him. However, seeing that things were beginning to look serious, the King of Munster yielded and was carried away prisoner with a golden fetter on him. The leader of the Circuit then turned northwards into Connacht, and carried away the king of that province. So he had the four provincial kings in his power, and also the Danish King of Dublin. But he did them neither hurt nor harm, for he seems to have been in a good humour all the time he was "on circuit"; and we are told by his poet laureate that on their halts the soldiers amused themselves in many ways, especially by music and dancing, and he says--