This episode appears to be partially inspired by Holy Blood, Holy Grail and The Messianic Legacy by Michael Baigent, Richard Leigh, and Henry Lincoln. The former book theorizes that Jesus Christ married Mary Magdalene and began a bloodline which merged with the royal bloodline of France's Merovingian dynasty. According to Baigent, et al, this bloodline survives to the present day and is protected by a secret society called the Priory of Zion. This secret society appears to be the inspiration for "The Family". The statue of the Black Virgin coming to Clare in a boat appears to be a reference to a legend cocerning a mysterious boat without oars that docked in Bologne Sur Mer, France during the reign of Dagobert I. On board was a statue of the Virgin Mary holding the Child Jesus in her left arm.