All three films are partially derived from the concept of "Our Ladies of Sorrow" (Mater Lachrymarum, Mater Suspiriorum and Mater Tenebrarum) originally devised by Thomas de Quincey in his book "Suspiria de Profundis" (1845).
Все три фильма частично основаны на концепции «Левана и Богоматери Скорбящие» ("Mater Lachrymarum", "Mater Suspiriorum", and "Mater Tenebrarum") из романа Томаса де Куинси «Suspiria de Profundis» (1845).