- Marriage: Art Ean Fhear King of Ireland 
The story is told that Achtan had a vision as she slept next to Art. She saw herself with her head cut off and a great tree growing out of her neck. Its branches spread all over Ireland, until the sea rose and overwhelmed it. Another tree grew from the roots of the first, but the wind blew it down. At that she woke up and told Art what she had seen. Art explained that the head of every woman is her husband, and that she would lose her husband in battle the next day. The first tree was their son, who would be king over all Ireland, and the sea that overwhelmed it was a fish-bone that he would die choking on. The second tree was his son, Cairbre Lifechair , who would be king after him, and the wind that blew him down was a battle against the fianna , in which he would fall. The following day Art was defeated and killed by his nephew Lugaid mac Con , who became the new High King.
In a story reminiscent of the Roman myth of Romulus and Remus , Cormac was carried off in infancy by a she-wolf and reared with her cubs, but a hunter found him and brought him back to his mother. Achtan then took him to Fiachrae Cassán, who had been Art's foster-father. On the way they were attacked by wolves, but wild horses protected them.
Achtan married Art Ean Fhear King of Ireland  [MRIN: 551617623], son of Conn Ceadeathach King of Ireland  and Landabaria Már . (Art Ean Fhear King of Ireland  was born before 155 in Ireland and died in 195.). The cause of his death was Killed at the Battle of Magh Mucroimbe, County Galway.