[Ir., Fortress of De(a)lga].
Fortress of Cúchulainn in much of early Irish literature, identified with an ancient mound, popularly known today as Castletown Hill, which lies near Dundalk, Co. Louth, and close by Baile's Strand. The town of Dundalk, established 1186, takes its name from the ModIr. Dún Dealgan, but is not identical with Cúchulainn's fortress. The Fomorian (sometimes Fir Bolg) chief Delga built the fortress, naming it for himself. Cúchulainn lived here as a child, before taking it as his own.