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̽��ֱ��trial in which the famous astronomer, Johannes Kepler, defended his mother from accusations of witchcraft has been turned into an opera, following new research into the original 17th-century legal proceedings.

̽��ֱ��opera was conceived by Cambridge historian Professor Ulinka Rublack, a fellow of St John’s College. It made its debut in October as part of Cambridge ̽��ֱ��’s Festival of Ideas. A film of Kepler’s Trial: An��Opera is now available online.

Born in 1571, Johannes Kepler is one of the most admired astronomers who ever lived. He came from an ordinary family but became a major figure in the scientific revolution. He defended Copernicus’s idea that the sun was at the centre of the universe and defined three laws of planetary motion.

In 1615, at the height of his powers, Kepler abandoned his research to defend his elderly mother, Katharina, from charges of witchcraft. Her trial took place at the height of Europe’s infamous ‘witch-craze’. Thousands of people, mostly women, were executed for supposed dealings in the occult, and families were torn apart in a climate of paranoia and distrust.

̽��ֱ��new opera tells the remarkable tale of Katharina’s six-year ordeal, and her son’s dogged, and ultimately successful, defence. Rublack’s recent book, ̽��ֱ��Astronomer and the Witch, is the first to provide a full account of the case.

It is not the first time that aspects of Johannes Kepler’s life have been given the operatic treatment. Philip Glass’s Kepler focused on the astronomer’s life and work, but overlooked the trial completely. In 1957, the German composer, Paul Hindemith, composed Die Harmonie der Welt (Harmony Of ̽��ֱ��World, also the title of one of Kepler’s most famous works.)

Like many other accounts of Kepler’s story, which either unwittingly swallow the 17th-century prosecution’s character assassination of Katharina, or reproduce it for dramatic effect, these treatments presented Kepler’s mother as crazed and witchlike.

Rublack sees the most recent opera as a response, in particular, to Hindemith’s work. “When I finished the book, I thought, there really has got to be a new opera about the subject now,” she said. “Hindemith depicts Katharina as a crazed, old crone. I wanted to put together a team to develop new perspectives and create a new way to tell the story.”

Kepler's Trial: An Opera draws on Rublack's research with supporting contributions from a group of interdisciplinary scholars and academics. ̽��ֱ��libretto was written by Tim Watts, a composer who teaches music at St John’s College and lectures in the ̽��ֱ��’s Faculty of Music.

̽��ֱ��performance features video sequences by the artist Aura Satz, who is based at the Royal College of Art. ̽��ֱ��videos are designed to amplify its presiding themes: darkness and light, sight and illusion, and competing depictions of an ageing and vulnerable woman.

“Around 25,000 people were executed for witchcraft in the 16th and 17th centuries,” Rublack said. “When Katharina was accused in 1615, she was actually at a point in her life when things were going very well. ̽��ֱ��accusation came as completely unexpected for her and the family, and turned into something profoundly disturbing.”

Although she was ultimately acquitted thanks to her son’s defence (as well as helpful connections in the upper echelons of the justice system), the trial had devastating consequences. Katharina was disowned by two of her other children and spent 14 months of the trial period living in a prison cell, chained to the floor. She emerged both physically and emotionally exhausted, and died just six months later.

̽��ֱ��opera makes use of musical styles from the time, drawing inspiration from the likes of Claudio Monteverdi as well as found materials such as contemporary drinking songs. It is performed using instruments that would have been popular during the period, such as cornets, sackbuts, and harpsichord.

̽��ֱ��premiere took place in the atmospheric surroundings of the Chapel of St John’s College. ̽��ֱ��six violinists playing at the event were all from St John's; they included the College's Musician-in-Residence, Margaret Faultless, as well as five students.

̽��ֱ��trial papers are still preserved in regional archives in Stuttgart. ̽��ֱ��libretto draws on the actual words of both Katharina and Johannes Kepler as they were recorded in court. Fragments of Katharina’s voice come through in prayers and her response to cross-examination, taken from the transcripts.

“It’s been easier to invent a voice for Katharina than it has been to define one for her son,” Watts reflected. “So many of his words exist already and we know a large amount about the kind of man he was, so there’s a lot more to filter.”

“ ̽��ֱ��way that we tell the story offers a huge range for potential identification with characters and elements. There is a sense of worlds and generations colliding; it’s my hope that the piece involves such a range of character and generation that it will appeal to an equally wide range of people.”