A series of novels based on Robert Howard's character Cormac Mac Art: named after one of the historical High Kings of Ireland, Howards' Cormac Mac Art is a Gael who sails with a band of Vikings during the era of King Arthur.
All in all, Andrew J. Offutt wrote six novels about Cormac Mac Art. Only the last two, which were co-written with Australian author Keith Taylor, are individually indexed on AustLit.
The full series is as follows:
Sword of the Gael (1975)
The Undying Wizard (1976)
The Sign of the Moonbow (1977)
The Mists of Doom (1977)
When Death Birds Fly (1980, with Keith Taylor)
The Tower of Death (1982, with Keith Taylor)