Lincoln also appeared in other television series such as The Avengers (1961, 1963), The Saint (1967), Man in a Suitcase (1968), and The Champions (1969); as well as in the 1968 film Don't Raise the Bridge, Lower the River.
[2] He was co-writer, with Mervyn Haisman, of three Doctor Who stories starring Patrick Troughton: The Abominable Snowmen (1967), The Web of Fear (1968) and The Dominators (1968) and retained the rights to the recurring character Brigadier Lethbridge-Stewart.
The book reproduced copies of Latin parchments that had been found by the parish priest of Rennes-le-Château, Bérenger Saunière, within a pillar inside his Romanesque church.
Inspired by what appeared to be secret codes hidden in the Latin text, Lincoln did some research about the parchments and a possible treasure, writing several books presenting his theories about the area.
The three discovered that they shared a common interest in the Knights Templar, and between them later developed a theory that Jesus Christ had started a bloodline that had later intermarried with the Frankish Merovingian royal dynasty.
The Man behind the Da Vinci Code, Lincoln stated that he did not wish to take part in the proceedings because the ideas brought forth in Holy Blood were not even original themselves, and Brown's actions could only be described as, "a bit naughty".
[10] The series presented elements of Lincoln's lifelong research on Rennes-le-Château, such as an alleged link between the area and the painting Les Bergers d'Arcadie by the 17th-century painter Nicolas Poussin.
[12][13] Mainstream historians and specialists in medieval architecture believe that the four central-plan churches in Ny, Nylars, Ols and Østerlars in Bornholm were built as a result of the pilgrimages made by Sigurd I of Norway to the recaptured Jerusalem between 1107 and 1111.
"[15] On 8 November 2003, Lincoln was awarded a Honorary Knighthood in the Militi Templi Scotia order, in recognition of his work in the fields of sacred geometry and Templar history.