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In July 2015, Iran agreed to temporarily limit its nuclear programme. The deal was finalised in Vienna, the capital of Austria.

Officially known as the Joint Comprehensive Plan of Action (JCPOA), it was agreed with a group of world powers known as the P5+1 – the US, UK, France, China, Russia and Germany, together with the EU.

The accord came after years of tension over Iran’s alleged efforts to develop a nuclear weapon. Iran insisted that its nuclear programme was entirely peaceful, but much of the international community did not believe that. Iran agreed to limit its nuclear programme and facilitate international inspections, in return for economic sanctions relief.

Baroness Catherine Ashton, who was the European Union’s High Representative for Foreign Affairs and Security Policy, tells Ben Henderson how the plan was achieved.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by the past. We take you to the events that have shaped our world through the eyes of the people who were there.

For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more.

Recent episodes explore everything from the death of Adolf Hitler, the first spacewalk and the making of the movie Jaws, to celebrity tortoise Lonesome George, the Kobe earthquake and the invention of superglue.

We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: Eva Peron – Argentina’s Evita; President Ronald Reagan and his famous ‘tear down this wall’ speech; Thomas Keneally on why he wrote Schindler’s List; and Jacques Derrida, France’s ‘rock star’ philosopher.

You can learn all about fascinating and surprising stories, such as the civil rights swimming protest; the disastrous D-Day rehearsal; and the death of one of the world’s oldest languages.