Court poet of Iubdán, a ruler of fairy land. To deflate his patron's boastfulness, Eisirt proclaimed that the men of Ulster were giants; and to prove his point he journeyed to the court of Fergus mac Léti, retrieving Áeda (1), a dwarf who seemed a giant to Iubdán's court. Eisirt then laid a demeaning geis on Iubdán; the king must travel himself to Emain Macha and be the first there to eat porridge in the morning. Eisirt then correctly predicted that Iubdán would fail and be imprisoned for a year and a day; his release would come only when he parted with his dearest possessions. Through his psychic powers Eisirt could tell that Fergus mac Léti was having an affair with his steward's wife and that his wife was having another with her stepson.