In 2015 Goodluck Jonathan became the first Nigerian president to concede election defeat. It allowed the transfer of power to the opposition party in Africa's biggest democracy - a country that had hitherto experienced vote-rigging and violence.

His special adviser on media and publicity Dr Reuben Abati tells Josephine McDermott about the moment when the president phoned his opponent Muhammadu Bahari to congratulate him on winning the election.

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.

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(Photo: President Goodluck Jonathan and Gen Muhammadu Buhari before the 2015 election. Credit: Getty Images)