The images vary widely, but they tend to be very strange and even disturbing—overt sexual acts, defecation, monsters, human-monster hybrids, animals acting like humans. There’s also examples of clergy behaving very badly, the sort of thing you would not expect to see in the margins of a sacred book.Kaitlin Manning of B & L Rootenberg Rare Books and Manuscripts talks to Collector's Weekly (previously) about the exquisitely detailed religious texts surrounded by all manner of illustrated commentary, known today as marginalia.
Devil Worship: The Sacred Books and Traditions of the Yezidiz, by Isya Joseph, 1919. 'This is one of the only public domain sources of information on the religious beliefs of the Yezidi, a small group originally from the northern region of Iraq. Although they speak Kurdish, they are a distinct population from the Kurds. The Yezidi are notable because they have been described as devil-worshippers, which has naturally led to constant persecution by the dominant Islamic culture of the region ... They have many unique beliefs, such as that the first Yezidi were created by Adam by parthenogenesis separately from Eve ... ' New on sacred-texts.com.