The novel’s central quest for powerful magical artifacts is rooted in medieval Irish mythology. According to texts like the 11th-century Lebor Gabála Érenn (The Book of the Taking of Ireland), the Tuatha Dé Danann were a supernatural race believed to be descended from the earth-mother goddess Danu. When the Tuatha migrated to Ireland, they brought four magical treasures given to them by Danu: 

These treasures were the stone of Fal, which cried out when a true king of Ireland stood on it; the magic sword of Nuada, which dealt mortal blows; the […] spear of Lugh, which was famous for its accuracy; and the cauldron of Dagda, which held an unending supply of food (Beech, Linda Ward. “Tuatha Dé Danann [Celtic Mythology].” EBSCO, 2022). 

Despite these wondrous treasures, the Tuatha were defeated by a group called the Milesians. Although they were allowed to stay in Ireland, the godlike beings were forced to become invisible and dwell underground. Eventually, they become known as the sidhe, or fairies. Linde reinterprets the Tuatha’s treasures as the artifacts sought by Graves throughout the Oak & Holly Cycle. This mythological foundation provides the narrative framework for the series. At the start of the novel, Kierse already possesses the Spear of Lugh, having stolen it in the previous book. The primary plot of The Robin on the Oak Throne revolves around Graves’s attempt to acquire the Cauldron of Dagda, and Lorcan seeks the Stone of Fal at the end of the novel. Understanding the legends behind these artifacts elevates the characters’ missions from simple heists to a grand pursuit of god-like power, grounding the fantasy plot in a rich literary tradition.