The 17th Century Queen Njinga was among the most successful of Africa's rulers in resisting European colonialism: she defied no fewer than 13 different Portuguese governors of modern-day Angola and ruled the kingdoms of Ndongo and Matamba for over three decades. She was no ordinary person, the warrior Queen. She was a fearless fighter, a military strategist, often ruthless, a shrewd diplomat and an inspirational leader in a period of huge turmoil, shifting alliances and conflict. Her name still resonates throughout the region and she stands as a symbol of the continent's fight against oppression. Rajan Datar is joined by professor Linda Heywood, author of the first comprehensive biography of Njinga in English, professor Roquinaldo Ferreira whose many publications include studies of the frequent social and cultural exchanges between Brazil and central Africa; and one of the leading experts on west African economic history Dr Toby Green.(Photo: Statue of Queen Njinga in Luanda, Angola. Sculptor: Rui de Matos. Credit: mtcurado/Getty Images)

Leonardo da Vinci is best known for his paintings - creating masterpieces like the Mona Lisa and The Last Supper. But through his notes and drawings we know him also to have been a sculptor, mathematician, botanist, palaeontologist, anatomist, architect and engineer, recording insights and inventions that were astonishingly ahead of their time. So what do his observations and experiments tell us about his unique understanding of the visible world around him? To mark the 500th anniversary of Leonardo's death Bridget Kendall talks to Martin Kemp, Emeritus Professor in the History of Art at Oxford University in the UK; Carmen C. Bambach, a curator at The Metropolitan Museum of Art, New York, in the US; and Prof Marina Wallace, a curator and art historian.Photo: Leonardo Da Vinci (1452-1519), Self-portrait, Red Chalk Drawing (Christophel Fine Art/Getty Images)

It’s been called the 'gymnasium of the mind', both mental exercise and a way to build self-esteem. Born some 1,500 years ago, the game of chess was one of the world’s first strategy board games, though little is still known about its origins. Was it first conceived to teach Indian army generals? Or devised to turn a tyrannical King into a virtuous ruler? Or was it a meditative diversion for Japanese monks? It’s easy to forget that the modern game of chess is only 500 years old – and that other ancient forms of Chess, like Xiangqi in China and Shogi in Japan, are much older, still evolving and still played today. Joining Bridget Kendall to explore the history of chess, are the chess historians Jean-Louis Cazaux and Rick Knowlton, the novelist Andrei Kurkov who’s followed the dramas of Russian chess through the ages, and the Grandmaster Jovanka Houska who’ll be challenging Bridget to a game of chess in the studio.Photo: Rick Knowlton's sculpted reproductions of the first confirmed chessmen ever discovered. The original pieces were found in Afrasiab, the ancient city of Samarkand (in present-day Uzbekistan) in 1977. They are dated at approximately AD 700. (Rick Knowlton)

It is an all-time adventure classic, a novel by Jules Verne that started life in serialized form 150 years ago and has gripped readers ever since, making it one of the most translated works in publishing history (and yes, the original French title says 'seas' in plural). It also made a household name out of its main character, Captain Nemo, the troubled and enigmatic commander who transports us through underwater wonders - including the lost world of Atlantis - in Nautilus, a submarine that itself is a technological marvel. So popular is the story, stars as famous as James Mason, Omar Sharif and Michael Caine have featured in movie versions. But there are dark undercurrents in the novel, themes of anger and revenge, as well as a number of enigmatic passages. To explore the long-lasting appeal of Twenty Thousand Leagues under the Seas, Rajan Datar is joined by Marie-Helene Huet, professor of French at Princeton University and MIT; French writer and translator Laurence Sudret, general secretary of the Société Jules Verne; Swiss-born author and engineer Jean-Michel Margot who had amassed one of the world's foremost collections of Verne materials; and Terry Harpold, Professor of English, Film and Media Studies at the University of Florida who specializes in science fiction.Photo: Submarine in the style of Captain Nemo's 'Nautilus'. (inhauscreative/Getty Images)

The story of how an average-sized artillery officer from a small Mediterranean island came to dominate revolutionary France and become the international celebrity of his age is an extraordinary one. Born on Corsica in 1769, Napoleon Bonaparte appeared to avoid engaging with the military career for which he was destined. And yet within a decade, his ambition, ego and enormous talent for self-promotion propelled him to the rank of general and eventually the highest office in France.At the beginning of the 19th century Napoleon’s rise appeared unstoppable. He was declared First Consul for life, then crowned himself Emperor of the French. He brought a period of much-needed stability to France and codified laws and systems which exist to this day. When his wife Joséphine was unable to give him a child, he divorced her and cemented an alliance with Austria’s imperial family. At its height, the Napoleonic empire stretched across most of Western Europe and numbered 40 million people. But his continuing thirst for power also sowed the seeds of his downfall.Bridget Kendall delves into the life and legacy of one of history’s most divisive figures. With guests Rafe Blaufarb, Professor of History at Florida State University in the US; Kate Astbury, Professor of French Studies at the University of Warwick, UK and the co-curator of www.100days.eu ; and Professor Annie Jourdan from the University of Amsterdam, Holland.Photo: Jacques-Louis David painting 'The Emperor Napoleon in His Study at the Tuileries', 1812 (VCG Wilson/Corbis via Getty Images)

The trade in spices goes back to ancient times: from the Frankincense trails that originated in the Dhofar Highlands in present day Yemen to the Queen of Sheba who travelled to Jerusalem with camels laden with spices. For centuries, spices have captured our imagination far more than any other commodities, and spice traders, from the Arab merchants to the European trading companies of the Age of Discovery, capitalised on the mystique of these luxurious aromatics to create a value chain that led to vast fortunes being made and Empires established. And this worldwide craze for spices played a great part in the rise of globalised trade and the birth of the Stock exchange and the capitalist system.Joining Rajan Datar to discuss the Spice Trade is Professor Gary Paul Nabhan whose ancestors were Arab spice merchants and who’s the author of "Cumin, Camels, and Caravans: A Spice Odyssey", Dr Chris Nierstrasz, Lecturer in Global History at Erasmus University in Rotterdam and specialist on the United Dutch East India Company, and the TV Chef and Indian cookery writer Anjum Anand.

Tove Jansson was a Finnish-Swedish author and illustrator best known for her children's books about the Moomins. These white, hippo-like characters live in the imaginary world of Moominvalley where they subtly challenge social norms and utter philosophical statements such as "I knew nothing, but I believed a lot." While the Moomins brought Jansson worldwide fame in the 20th century, she was also a painter, an accomplished novelist and a political cartoonist who took risks poking fun at Hitler. Her work often mirrored her private life in which she defied stereotypes of the time by working and earning money for her family, travelling alone, and having relationships with both men and women.Joining Rajan Datar to discuss the life and works of Tove Jansson are her niece, Sophia Jansson; Boel Westin - a professor of children's literature from Stockholm University and the author of the authorised biography of Tove's life called Life, Art, Words; and British children's author Philip Ardagh, author of The World of Moominvalley. Plus Mayumi Tomihara - an expert on Tove Jansson from Tokyo's Sacred Heart University who has translated many of Tove's adult novels into Japanese.First broadcast on the BBC World Service in March 2019.Photo: Finnish illustrator Tove Jansson in a self-portrait with her Moomin characters (© Moomin Characters™)

Millions of us around the world have undergone an anaesthetic, putting our trust in specialists who keep us alive while surgeons carry out complex operations. Huge advances have been made in this field in the last 150 years, thanks to the work of pioneering doctors, dentists and scientists who often risked their own lives to advance the possibilities of surgery and make anaesthetics safe. And yet in this twilight world of artificial sleep, there are many things experts still don’t understand about what is really happening in the brain and how our consciousness is affected. And what of the reports of patients waking during surgery? How credible are these stories and what can they tell us about memory, consciousness and human experience?Photo: A patient going under general anaesthesia. (BSIP/UIG via Getty Images)

Today, the Istanbul-born Armenian financier Calouste Gulbenkian is mostly remembered as a great art collector and philanthropist; at his death in 1955 he was thought of as the world's richest man. But perhaps more than any of the above, he may have been the world's most tenacious negotiator: how else would he have held on - for decades - to the main source of his fabulous wealth, his minority share in major oil companies, despite their concerted effort to push him out? In the 150th year of Gulbenkian's birth, Rajan Datar follows Calouste's life and deal-making with his great grandson Martin Essayan; historian Dr. Jonathan Conlin, author of a new biography of Gulbenkian; and Professor of Business History Joost Jonker.Photo: Calouste Gulbenkian (credit: Arquivos Gulbenkian)

The story of Robinson Crusoe and his many years of survival alone on a deserted island has enchanted the English-speaking world for centuries. Many people first come across the story as a children’s book or a film portrayal, celebrating Crusoe’s buccaneering adventures and his heroic efforts to tame his wild environment, create shelter and food supplies, and eventually befriend the indigenous man he calls Friday. But closer reading of Daniel Defoe’s original novel, written 300 years ago this spring, reveals a more complex tale of sin and redemption, debating fundamental questions about man’s place in the world against a backdrop of colonial expansion, transatlantic commerce and the slave trade.Bridget Kendall talks to the Defoe scholar Professor Andreas Mueller from the University of Northern Colorado in the USA; Olivette Otele, Professor of History at Bath Spa University in the UK; and Karen O’Brien, Professor of English Literature at the University of Oxford in the UK.Photo: Engraving of Robinson Crusoe by Wal Paquet. (Ipsumpix/Corbis via Getty Images)