Ailill mac Máta is the king of the Connachta and the husband of queen Medb[1] in the Ulster Cycle of Irish mythology.
The Táin Bó Cúailnge says Medb chose him as husband, ahead of Find, Cairbre and Conchobar, because he alone among them was without meanness, jealousy or fear.
Their wealth was equal, except for one thing: the bull Finnbhennach, who was born into Medb's herd, but thought it was beneath his dignity to be owned by a woman and transferred himself into Ailill's ownership.
Medb and Ailill offered their daughter Findabair in marriage to a series of heroes as payment for fighting Cú Chulainn, but all were defeated.
The Connachta were forced to retreat, but Donn Cúailnge was brought back to Cruachan, where he fought Finnbhennach, killed him, and died of his wounds.
His blind brother Lugaid Dalléces was nearby, so Ailill told him a hart and a doe were playing in the lake, and challenged him to kill them with a spear.
[7] Late in life, the Ulaid hero Conall Cernach came to stay with Ailill and Medb, as theirs was the only household in Ireland that could satisfy his enormous appetite.