In the Middle Ages, Prester John was seen as the great hope for Crusaders struggling to hold on to, then regain, Jerusalem. He was thought to rule a lost Christian kingdom somewhere in the East and was ready to attack Muslim opponents with his enormous armies. There was apparent proof of Prester John's existence, in letters purportedly from him and in stories from travelers who claimed they had met, if not him, then people who had news of him. Most pointed to a home in the earthly paradise in the Indies, outside Eden, with fantastical animals and unimaginable riches. Later, Portuguese explorers thought they had found him in Ethiopia, despite the mystified denials of people there. Melvyn Bragg asks why the legend was so strongly believed for so long, and what facts helped sustain the myths.

With

Marianne O'Doherty

Martin Palmer

And

Amanda Power

Producer: Simon Tillotson.

It is said that, in Britain from the 18th Century, copies of Josephus' works were as widespread and as well read as The Bible. Christians valued "The Antiquities of the Jews" in particular, for the retelling of parts of the Old Testament and apparently corroborating the historical existence of Jesus. Born Joseph son of Matthias, in Jerusalem, in 37AD, he fought the Romans in Galilee in the First Jewish-Roman War. He was captured by Vespasian's troops and became a Roman citizen, later describing the siege and fall of Jerusalem. His actions and writings made him a controversial figure, from his lifetime to the present day.

With

Tessa Rajak

Philip Alexander

And

Martin Goodman

Producer: Simon Tillotson.

Melvyn Bragg and his guests discuss the life of Matteo Ricci, a Jesuit priest who in the 16th century led a Christian mission to China. An accomplished scholar, Ricci travelled extensively and came into contact with senior officials of the Ming Dynasty administration. His story is one of the most important encounters between Renaissance Europe and a China which was still virtually closed to outsiders.

With

Mary Laven

Craig Clunas

and

Anne Gerritsen

Producer: Simon Tillotson.

Melvyn Bragg and his guests discuss the life and work of Al-Ghazali, a major philosopher and theologian of the late 11th century. Born in Persia, he was one of the most prominent intellectuals of his age, working in such centres of learning as Baghdad, Damascus and Jerusalem. He is now seen as a key figure in the development of Islamic thought, not just refining the theology of Islam but also building on the existing philosophical tradition inherited from the ancient Greeks.

With:

Peter Adamson

Carole Hillenbrand

Robert Gleave

Producer: Victoria Brignell.

Melvyn Bragg and guests discuss Zen. It's often thought of as a form of Buddhism that emphasises the practice of meditation over any particular set of beliefs. In fact Zen belongs to a particular intellectual tradition within Buddhism that took root in China in the 6th century AD. It spread to Japan in the early Middle Ages, where Zen practitioners set up religious institutions like temples, monasteries and universities that remain important today.

GUESTS

Tim Barrett, Emeritus Professor in the Department of the Study of Religions at SOAS, University of London

Lucia Dolce, Numata Reader in Japanese Buddhism at SOAS, University of London

Eric Greene, Lecturer in East Asian Religions at the University of Bristol

Producer: Luke Mulhall.

Melvyn Bragg and his guests discuss one of the most remarkable figures of the Middle Ages, Hildegard of Bingen. The abbess of a Benedictine convent, Hildegard experienced a series of mystical visions which she documented in her writings. She was an influential person in the religious world and much of her extensive correspondence with popes, monarchs and other important figures survives. Hildegard was also celebrated for her wide-ranging scholarship, which as well as theology covered the natural world, science and medicine. Officially recognised as a saint by the Catholic Church in 2012, Hildegard is also one of the earliest known composers. Since their rediscovery in recent decades her compositions have been widely recorded and performed.

With:

Miri Rubin

William Flynn

Almut Suerbaum

Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the history and contents of the Talmud, one of the most important texts of Judaism. The Talmud was probably written down over a period of several hundred years, beginning in the 2nd century. It contains the authoritative text of the traditional Jewish oral law, and also an account of early Rabbinic discussion of, and commentary on, these laws. In later centuries scholars wrote important commentaries on these texts, which remain central to most strands of modern Judaism.

With:

Philip Alexander

Rabbi Norman Solomon

Laliv Clenman

Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the work of George Berkeley, an Anglican bishop who was one of the most important philosophers of the eighteenth century. Bishop Berkeley believed that objects only truly exist in the mind of somebody who perceives them - an idea he called immaterialism. His interests and writing ranged widely, from the science of optics to religion and the medicinal benefits of tar water. His work on the nature of perception was a spur to many later thinkers, including David Hume and Immanuel Kant. The clarity of Berkeley's writing, and his ability to pose a profound problem in an easily understood form, has made him one of the most admired early modern thinkers.

With:

Peter Millican

Tom Stoneham

Michela Massimi

Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Trinity. The idea that God is a single entity, but one known in three distinct forms - Father, Son and Holy Spirit - has been a central belief for most Christians since the earliest years of the religion. The doctrine was often controversial in the early years of the Church, until clarified by the Council of Nicaea in the late 4th century. Later thinkers including St Augustine and Thomas Aquinas recognised that this religious mystery posed profound theological questions, such as whether the three persons of the Trinity always acted together, and whether they were of equal status. The Trinity's influence on Christian thought and practice is considerable, although it is interpreted in different ways by different Christian traditions.

With:

Janet Soskice

Martin Palmer

The Reverend Graham Ward

Producer: Thomas Morris.

Melvyn Bragg and his guests discuss Hindu ideas about Creation. According to most Western religious traditions, a deity was the original creator of the Universe. Hinduism, on the other hand, has no single creation story. For thousands of years, Hindu thinkers have taken a variety of approaches to the question of where we come from, with some making the case for divine intervention and others asking whether it is even possible for humans to comprehend the nature of creation. The origin of our existence, and the nature of the Universe we live in, is one of the richest strands of Hindu thought.

With:

Jessica Frazier

Chakravarthi Ram-Prasad

Gavin Flood

Producer: Thomas Morris.