Melvyn Bragg and his guests discuss Gnosticism, a sect associated with early Christianity. The Gnostics divided the universe into two domains: the visible world and the spiritual one. They believed that a special sort of knowledge, or gnosis, would enable them to escape the evils of the physical world and allow them access to the higher spiritual realm. The Gnostics were regarded as heretics by many of the Church Fathers, but their influence was important in defining the course of early Christianity. A major archaeological discovery in Egypt in the 1940s, when a large cache of Gnostic texts were found buried in an earthenware jar, enabled scholars to learn considerably more about their beliefs.With:Martin Palmer Director of the International Consultancy on Religion, Education, and CultureCaroline Humfress Reader in History at Birkbeck College, University of LondonAlastair Logan Honorary University Fellow of the Department of Theology and Religion at the University of ExeterProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the cult of Mithras, a mystery religion that existed in the Roman Empire from the 1st to the 4th centuries AD. Also known as the Mysteries of Mithras, its origins are uncertain. Academics have suggested a link with the ancient Vedic god Mitra and the Iranian Zoroastrian deity Mithra, but the extent and nature of the connection is a matter of controversy. Followers of Mithras are thought to have taken part in various rituals, most notably communal meals and a complex seven-stage initiation system. Typical depictions of Mithras show him being born from a rock, enjoying food with the sun god Sol and stabbing a bull. Mithraic places of worship have been found throughout the Roman world, including an impressive example in London. However, Mithraism went into decline in the 4th century AD with the rise of Christianity and eventually completely disappeared. In recent decades, many aspects of the cult have provoked debate, especially as there are no written accounts by its members. As a result, archaeology has been of great importance in the study of Mithraism and has provided new insights into the religion and its adherents. With:Greg Woolf Professor of Ancient History at the University of St AndrewsAlmut Hintze Zartoshty Professor of Zoroastrianism at SOAS, University of LondonJohn North Acting Director of the Institute of Classical Studies, University of London.Producer: Victoria Brignell.

Melvyn Bragg and his guests discuss the Upanishads, the ancient sacred texts of Hinduism. Dating from about 700 BC, the Upanishads were passed down through an oral tradition in priestly castes and were not written down until the 6th century AD. They constitute the final part of the Vedas, the collection of texts which form the foundation of the Indian Hindu world, and were originally spoken during sacrificial rituals.Yet the Upanishads go beyond incantations performed during sacrifices, and ask profound questions about human existence and man's place in the cosmos. The concepts of Brahman (the universal cosmic power) and Atman (the deeper soul of the individual) are central to the understanding of the Upanishads. Each individual treatise has its own character. Some are poetic; some are scientific; others are dialogues between kings and sages or metaphysical reflections. More than one hundred Upanishads were produced, thirteen of which are regarded as the canonical scriptures of Hinduism.With:Jessica Frazier Lecturer in Religious Studies at the University of Kent and a Research Fellow at the Oxford Centre for Hindu Studies at the University of OxfordChakravarthi Ram-Prasad Professor of Comparative Religion and Philosophy at Lancaster UniversitySimon Brodbeck Lecturer in Religious Studies at the University of CardiffProducer: Natalia Fernandez.

Melvyn Bragg and his guests discuss the Ontological Argument. In the eleventh century St Anselm of Canterbury proposed that it was possible to prove the existence of God using reason alone. His argument was ridiculed by some of his contemporaries, but was analysed and improved by later thinkers including Descartes, Spinoza and Leibniz. Other philosophers have been less kind, with the Enlightenment thinker David Hume offering one possible refutation. But the debate continued, fuelled by interventions from such heavyweights as Immanuel Kant and Kurt Gödel; and it remains one of the most discussed problems in philosophy.With:John Haldane Professor of Philosophy at the University of St AndrewsPeter Millican Professor of Philosophy at the University of OxfordClare Carlisle Lecturer in Philosophy of Religion at King's College LondonProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the biblical king Solomon, celebrated for his wisdom and as the architect of the First Temple in Jerusalem. According to the Old Testament account of his life, Solomon was chosen as his father David's successor as Israelite king, and instead of praying for long life or wealth asked God for wisdom. In the words of the Authorised Version, "And there came of all people to hear the wisdom of Solomon, from all kings of the earth, which had heard of his wisdom." Solomon is an important figure in Judaism, Islam and Christianity alike, and is also credited with the authorship of several scriptural texts. His name is associated with the tradition of wisdom literature and with a large number of myths and legends. For many centuries Solomon was seen as the archetypal enlightened monarch, and his example influenced notions of kingship from the Middle Ages onwards.With:Martin PalmerDirector of the International Consultancy on Religion, Education, and CulturePhilip AlexanderEmeritus Professor of Jewish Studies at the University of ManchesterKatharine DellSenior Lecturer in Old Testament Studies at the University of Cambridge, and Fellow of St Catherine's College, CambridgeProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the origins of Quakerism. In the mid-seventeenth century an itinerant preacher, George Fox, became the central figure of a group known as the Religious Society of Friends, whose members believed it was possible to obtain contact with Christ without priestly intercession. The Quakers, as they became known, rejected the established Church and what they saw as the artificial pomp and artifice of its worship. They argued for religious toleration and for the equality of men and women. Persecuted for many years, particularly after the Restoration of Charles II in 1660, the Quakers survived to become an influential religious group, known for their pacifism and philanthropy. With:Justin ChampionProfessor of the History of Early Modern Ideas at Royal Holloway, University of LondonJohn CoffeyProfessor of Early Modern History at the University of LeicesterKate PetersFellow in History at Murray Edwards College at the University of Cambridge.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the life and work of the Dutch humanist scholar Desiderius Erasmus. In his lifetime Erasmus was almost universally recognised as the greatest classical scholar of his age, the translator and editor of numerous Latin and Greek texts. But above all he was a religious scholar who published important editions of the Bible which expunged many corruptions to the texts of the Scriptures. He was an outspoken critic of the Church, whose biting satire on its excesses, In Praise of Folly, was famed throughout Europe.When the Reformation began in 1517, however, Erasmus chose to remain a member of the Catholic Church rather than side with Martin Luther and the reformers, and a few years later he engaged in a celebrated debate with Luther on the subject of free will. Through his writings on the Church, on education and the wide gamut of humanist scholarship, Erasmus is remembered today as one of the greatest thinkers of the northern Renaissance.With:Diarmaid MacCullochProfessor of the History of the Church at the University of OxfordEamon DuffyProfessor of the History of Christianity at the University of CambridgeJill KrayeProfessor of the History of Renaissance Philosophy and Librarian at the Warburg Institute, University of London.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Safavid Dynasty, rulers of the Persian empire between the 16th and 18th centuries.In 1501 Shah Ismail, a boy of fifteen, declared himself ruler of Azerbaijan. Within a year he had expanded his territory to include most of Persia, and founded a ruling dynasty which was to last for more than two hundred years. At the peak of their success the Safavids ruled over a vast territory which included all of modern-day Iran. They converted their subjects to Shi'a Islam, and so created the religious identity of modern Iran - although they were also often ruthless in their suppression of Sunni practices. They thrived on international trade, and their capital Isfahan, rebuilt by the visionary Shah Abbas, became one of the most magnificent cities in the world. Under Safavid rule Persia became a cultural centre, producing many great artists and thinkers. With:Robert GleaveProfessor of Arabic Studies at the University of ExeterEmma LoosleySenior Lecturer at the School of Arts, Histories and Cultures at the University of ManchesterAndrew NewmanReader in Islamic Studies and Persian at the University of Edinburgh.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Concordat of Worms. This treaty between the papacy and the Holy Roman Empire, signed in 1122, put an end, at least for a time, to years of power struggle and bloodshed. The wrangling between the German kings and the Church over who had the ultimate authority to elect bishops, use the ceremonial symbols of office in his coronation and even choose the pope himself, was responsible for centuries of discord. The hatred between the two parties reached such a pinnacle that it resulted in the virtual destruction of Rome at the hands of the Normans in 1084.Nearly forty years later Emperor Henry V and Pope Calixtus II came to a compromise; their agreement became known as the Concordat of Worms, named after the town where they met and signed the treaty. The Concordat created a historic distinction between secular power and spiritual authority, and more clearly defined the respective powers of monarchs and the Church. Although in the short term the Concordat failed to prevent further conflict, some historians believe that it paved the way for the modern nation-state.With:Henrietta LeyserEmeritus Fellow of St Peter's College, University of OxfordKate CushingReader in Medieval History at Keele University John Gillingham Emeritus Professor of History at the London School of Economics and Political Science Producer: Natalia Fernandez.

Melvyn Bragg and his guests discuss the revolutionary Jewish leader Judas Maccabeus. Born in the second century BC, Judas led his followers, the Maccabees, in a rebellion against the Seleucid Empire, which was attempting to impose the Greek culture and religion on the Jews. After a succession of battles he succeeded and the Seleucid king granted the Jews religious freedom. But even after that freedom was granted the struggle for political independence continued, and it was not until twenty years after Judas's death that Judaea finally became an independent state. Thanks to an extensive, if often confused, historical record of these events, the story of the Maccabees is well known. Judas Maccabeus has become a celebrated folk hero, and one of his achievements, the restoration and purification of the Temple of Jerusalem after its desecration by the Seleucids, is commemorated every year at the Jewish festival of Hanukkah.With: Helen Bond, Senior Lecturer in the New Testament at Edinburgh University Tessa Rajak, Emeritus Professor of Ancient History at the University of ReadingPhilip Alexander, Emeritus Professor of Jewish Studies at the University of ManchesterProducer: Natalia Fernandez.