The Holy Blood and the Holy Grail
The Merovingians are featured in the book "The Holy Blood and the Holy Grail" (1982) where they are depicted as descendants of Jesus, inspired by the "Priory of Sion" story developed by Pierre Plantard in the 1960s. Plantard playfully sold the story as non-fiction, giving rise to a number of works of pseudohistory among which "The Holy Blood and the Holy Grail" was the most successful. The "Priory of Sion" material has given rise to later works in popular fiction, notably "The Da Vinci Code" (2003), which mentions the Merovingians in chapter 60.