"Demoniality; or, Incubi and Succubi" by Ludovico Maria Sinistrari is a theological treatise written in the seventeenth century. This Latin manuscript explores the sin of demoniality through examination of incubi and succubi—demonic entities believed to pursue sexual encounters with humans. Drawing from biblical texts and historical accounts, Sinistrari discusses these spirits' characteristics, their ability to deceive through shape-shifting, and the moral implications of human interaction with such beings, reflecting the era's religious perspectives on spiritual transgression.