It is elsewhere narrated that the Dun Bull of Cualnge, for whose sake Ailill and Medb [Note: Pronounce _Maive_.], the king and queen of Connaught, undertook this expedition, was one of two bulls in whom two rival swineherds, belonging to the supernatural race known as the people of the _Sid_, or fairy-mounds, were re-incarnated, after passing through various other forms. The other bull, Findbennach, the White-horned, was in the herd of Medb at Cruachan Ai, the Connaught capital, but left it to join Ailill's herd. This caused Ailill's possessions to exceed Medb's, and to equalise matters she determined to secure the great Dun Bull, who alone equalled the White-horned. An embassy to the owner of the Dun Bull failed, and Ailill and Medb therefore began preparations for an invasion of Ulster, in which province (then ruled by Conchobar Mac Nessa) Cualnge was situated. A number of smaller _Tana_, or cattle-raids, prefatory to the great _Tain Bo Cuailnge_, relate some of their efforts to procure allies and provisions. Medb chose for the expedition the time when Conchobar and all the warriors of Ulster, except Cuchulainn and Sualtaim, were at their capital, Emain Macha, in a sickness which fell on them periodically, making them powerless for action; another story relates the cause of this sickness, the effect of a curse laid on them by a fairy woman. Ulster was therefore defended only by the seventeen-year-old Cuchulainn, for Sualtaim's appearance is only spasmodic. Cuchulainn (Culann's Hound) was the son of Dechtire, the king's sister, his father being, in different accounts, either Sualtaim, an Ulster warrior; Lug Mac Ethlend, one of the divine heroes from the _Sid_, or fairy-mound; or Conchobar himself. The two former both appear as Cuchulainn's father in the present narrative. Cuchulainn is accompanied, throughout the adventures here told, by his charioteer, Loeg Mac Riangabra. In Medb's force were several Ulster heroes, including Cormac Condlongas, son of Conchobar, Conall Cernach, Dubthach Doeltenga, Fiacha Mac Firfebe, and Fergus Mac Roich. These were exiled from Ulster through a bitter quarrel with Conchobar, who had caused the betrayal and murder of the sons of Uisnech, when they had come to Ulster under the sworn protection of Fergus, as told in the _Exile of the Sons of Uisnech_. [Note: 1 Text in Windisch and Stokes's _Irische Texte_; English translation in Miss Hull's _Cuchullin Saga_.] The Ulster mischief-maker, Bricriu of the Poison-tongue, was also with the Connaught army. Though fighting for Connaught, the exiles have a friendly feeling for their former comrades, and a keen jealousy for the credit of Ulster. There is a constant interchange of courtesies between them and their old pupil, Cuchulainn, whom they do not scruple to exhort to fresh efforts for Ulster's honour. An equally half-hearted warrior is Lugaid Mac Nois, king of Munster, who was bound in friendship to the Ulstermen.