Achall

In Ulster Cycle tradition Achall is presented as the daughter of Cairbre Nia Fer, king of Tara, and Fedelm Noíchrothach. After her brother Erc was killed by the warrior Conall Cernach, Achall is said to have died of grief on a hill near Tara; that hill was thereafter called Achall. The hill-name becomes the locus for later legendary events — battles and episodes involving figures such as Túathal Techtmar, Elim mac Conrach, and Cormac mac Airt — and is identified in later tradition with the Hill of Skryne.

No physical or visual description of Achall is preserved in the cited sources. She is attested only as a named person in genealogical and place-lore passages: identified by parentage (daughter of Cairbre Nia Fer and Fedelm Noíchrothach), by relation (sister of Erc), and by the circumstance of her death. In the texts she appears as a narrative name-anchor — the personal name that explains the hill-name — rather than as a described individual with clothing, features, or iconography.

The sources record no supernatural abilities, powers, or characteristic behaviors for Achall. Her only notable action reported in the tradition is a mortal, emotional response — she "died of grief" at the slaying of her brother — and her significance is etiological: her death provides an origin for a place-name and a narrative tie between genealogical memory and landscape. She is not represented as an active guardian, spirit, or recurring supernatural presence in the available material.