The Mandaeans are a Gnostic sect that arose in the middle east around the same time as Christianity. What little study of the religion there has been has focused on the ancient Mandaeans and their relation to early Christianity. Buckley examines the lives and religion of contemporary Mandaeans, who live mainly in Iran and Iraq but also in New York and San Diego. She provides a comprehensive introduction to the religion and shows how its ancient texts inform the living religion, and vice versa.

Given the degree of popular fascination with Gnostic religions, it is surprising how few pay attention to the one such religion that has survived from antiquity until the present day: Mandaism. Mandaeans, who esteem John the Baptist as the most famous adherent to their religion, have in our time found themselves driven from their historic homelands by war and oppression. Today, they are a community in crisis, but they provide us with unparalleled access to a library of ancient Gnostic scriptures, as part of the living tradition that has sustained them across the centuries. Gnostic texts such as these have caught popular interest in recent times, as traditional assumptions about the original forms and cultural contexts of related religious traditions, such as Judaism, Christianity, and Islam, have been called into question. However, we can learn only so much from texts in isolation from their own contexts. Mandaean literature uniquely allows us not only to increase our knowledge about Gnosticism, and by extension all these other religions, but also to observe the relationship between Gnostic texts, rituals, beliefs, and living practices, both historically and in the present day.

This historical study argues that the Mandaean religion originated under Sasanid rule in the fifth century, not earlier as has been widely accepted. It analyzes primary sources in Syriac, Mandaic, and Arabic to clarify the early history of Mandaeism. This religion, along with several other, shorter-lived new faiths, such as Kentaeism, began in a period of state-sponsored persecution of Babylonian paganism. The Mandaeans would survive to become one of many groups known as Ṣābians by their Muslim neighbors. Rather than seeking to elucidate the history of Mandaeism in terms of other religions to which it can be related, this study approaches the religion through the history of its social contexts.

The Haran Gawaita (Mandaic "Inner Haran" or "Inner Hauran") is a Mandaean text which purports to tell the history of the Mandaeans and their arrival in Media as "Nasoraeans" from Jerusalem

The Mandaeans are a Gnostic sect that arose in the middle east around the same time as Christianity. What little study of the religion there has been has focused on the ancient Mandaeans and their relation to early Christianity. Buckley examines the lives and religion of contemporary Mandaeans, who live mainly in Iran and Iraq but also in New York and San Diego. She provides a comprehensive introduction to the religion and shows how its ancient texts inform the living religion, and vice versa.