Lawhead later wrote a final book Avalon, which is not considered to be a true addition to the cycle but rather a "related semi-sequel" to round out the "Once and Future King" aspect of the legend.
The series proceeds as told in the following descriptions: Tells simultaneously the story of the fall of Atlantis, the subsequent travel of Princess Charis and her family to Ynys Prydein (Britain), and the discovery and training of Taliesin as a druid/bard.
Tells of Myrddin's dual upbringing among the druids and Christian priests, his capture and mystical training among the Hill Folk, and his brief time as a king of Dyfed.
He experiences a doomed romance with Princess Ganieda and long years of madness as a wild man of the woods before finding his destiny.
Many historical personas (some already included in the Arthurian legend) exist in the cycle, alongside less "factual" characters: Taliesin, Magnus Maximus, Theodosius, Ambrosius Aurelianus, Vortigern, Constantine III, Myrddin Wyllt, Clovis I, Gwyddno Garanhir, Elffin ap Gwyddno, Horsa, Hengest, Cerdic, Aelle, Gildas, and Aneirin (in the series, it is revealed that the last two are the same person; born with the name Aneirin, he changes it to Gildas after Arthur's death).
[4] In July 2023, it was announced that The Daily Wire Co-CEO Jeremy Boreing would be taking a leave of absence from the company, to co-direct the seven-episode television series.
[5] In September, British actor Tom Sharp was announced to have been in the series' lead role as Merlin, as filming began in Europe.
[6] Later that month, the series' main cast was revealed, which includes Brett Cooper as Ganieda, Rose Reid as Charis and James Arden as Taliesin.