Most of the supervillains of Spider-Man would be introduced in The Amazing Spider-Man comic book starting with the Chameleon. The early villains would be introduced in the 1960s in the Silver Age of Comic Books, and created by Stan Lee and Steve Ditko. John Romita, Sr. replaced Ditko starting with the Rhino. Gerry Conway later replaced Stan Lee and helped create new adversaries for the web-slinger and also helped pave the way to the Bronze Age of Comic Books with the death of Spider-Man's long time romantic interest, Gwen Stacy. Many collaborators would soon take over The Amazing Spider-Man title. One of the more popular examples included Todd McFarlane's Venom in the Modern Age of Comic Books.
The practice may have originated in a Celtic festival, held on 31 October–1 November, to mark the beginning of winter. It was called Samhain in Ireland, Scotland and the Isle of Man, and Calan Gaeaf in Wales, Cornwall and Brittany. The festival is believed to have pre-Christian roots. After the Christianization of Ireland in the 5th century, some of these customs may have been retained in the Christian observance of All Hallows' Eve in that region—which continued to be called Samhain/Calan Gaeaf—blending the traditions of their ancestors with Christian ones. It was seen as a liminal time, when the spirits or fairies (the Aos Sí), and the souls of the dead, could more easily come into our world. It was believed that the Aos Sí needed to be propitiated to ensure that the people and their livestock survived the winter.