In
Goidelic mythology,
Boann ("she of the white cattle") was the wife of
Necthan or
Elcmar. Her lover was
Dagda, by whom she was the mother of
Aengus. In order to hide their affair, Dagda made the
sun stand still for nine months; therefore, Aengus was conceived, gestated and born in one day.
She was associated with a sacred white cow.
Alternative: Boand